Objective:To investigate the clinical effect of the guided bone regeneration(GBR)technique combined with temporary bridgework-guided gingival contouring in treating upper anterior tooth loss with labial bone defects.M...Objective:To investigate the clinical effect of the guided bone regeneration(GBR)technique combined with temporary bridgework-guided gingival contouring in treating upper anterior tooth loss with labial bone defects.Methods:From July 2023 to April 2024,80 patients with upper anterior tooth loss and labial bone defects were admitted to the hospital and selected as evaluation samples.They were divided into an observation group(n=40)and a control group(n=40)using a numerical table lottery scheme.The control group received treatment with the GBR technique,while the observation group received treatment with the GBR technique combined with temporary bridges to guide gingival contouring.The two groups were compared in terms of clinical red aesthetic scores(PES),labial alveolar bone density,labial bone wall thickness,gingival papillae,gingival margin levels,and patient satisfaction.Results:The PES scores of patients in the observation group were higher than those in the control group after surgery(P<0.05).The bone density of the labial alveolar bone and the thickness of the labial bone wall in the observation group were higher than those in the control group.The levels of gingival papillae and gingival margins were lower in the observation group after surgery(P<0.05).Additionally,patient satisfaction in the observation group was higher than in the control group(P<0.05).Conclusion:The GBR technique combined with temporary bridge-guided gingival contouring for treating upper anterior tooth loss with labial bone defects can improve the aesthetic effect of gingival soft tissue,increase alveolar bone density and the thickness of the labial bone wall,and enhance patient satisfaction.This approach is suitable for widespread application in healthcare institutions.展开更多
Labial agglutination occurs when the labia minora have become fused in the midline through either filmy or dense adhesions, forming a raphe. This condition is typically seen in pre-pubertal girls;however, there have b...Labial agglutination occurs when the labia minora have become fused in the midline through either filmy or dense adhesions, forming a raphe. This condition is typically seen in pre-pubertal girls;however, there have been cases reported in the literature of labial agglutination in postmenopausal and reproductive aged women. Labial agglutination has been associated with local irritation and inflammation in the setting of a hypoestrogenic state. Topical treatment is usually recommended prior to manual separation. However, some postmenopausal women have been refractory to conservative management, and surgery may then be required. We present a case of a 79-year-old Caucasian gravida 3 para 3 who was referred for treatment refractory labial agglutination for 3 years. The patient’s complaints included a small trickle escaping from the introitus during urination and the sensation of little urinary control. The patient underwent an exam under anesthesia. Gentle blunt dissection with a lacrimal dilator easily separated the labia minora down the visible midline fusion line (raphe). Bimanual exam then revealed a 12-week-sized enlarged uterus confirmed on ultrasound to be an 8 × 8 × 7 cm irregular mass concerning for uterine cancer. Proceeding to an operative release of severe labial agglutination can relieve patient discomfort and frustration when estradiol therapy has failed. In addition to alleviating symptoms, releasing labial agglutination can also provide the gynecologist access to critical screening procedures such as cervical cytology or a bimanual exam, all of which could lead to a diagnosis or pre-cancerous or cancerous lesions.展开更多
BACKGROUND Hemangioma is a vascular benign tumour of endothelial origin.It appears commonly in the first decade of life with increases incidence in females.Hemangioma is not common to happen in the oral cavity and it ...BACKGROUND Hemangioma is a vascular benign tumour of endothelial origin.It appears commonly in the first decade of life with increases incidence in females.Hemangioma is not common to happen in the oral cavity and it is extremely rare to appear in the labial vestibule.CASE SUMMARY We present a case of an 11-year-old girl who complained of a painful,slowly growing mass which was consistent with the capillary hemangioma in the left mandibular vestibule.Vascular tumor such as hemangioma in the mandibular vestibule is extremely rare;hence,the clinical definitive diagnosis is very challenging.Therefore,radiographic imaging and histopathologic analysis are crucial to reach to the final diagnosis for proper management.CONCLUSION Comprehensive clinical evaluation,proper diagnostic imaging and microscopic analysis of the mass establish a precise diagnosis of the hemangioma for better management.展开更多
Adhesions of the labia are extremely rare in the reproductive population with only a few cases described in the literature. We report a young female patient with coital and voiding difficulty. The patient was a 22-yea...Adhesions of the labia are extremely rare in the reproductive population with only a few cases described in the literature. We report a young female patient with coital and voiding difficulty. The patient was a 22-year-old woman presented with voiding difficulty and inability to achieve sexual intercourse. Clinical examination revealed normally developed labia majora, clitoris, and vaginal opening, but fused labia minora and pinhole external urethral orifice. Intraoperatively, labial fusion was dissected with sharp dissection. Urethral dilatation was performed with dittel dilators. Local estrogen ointment was administered postoperatively for four weeks resulting with complete resolution of coital and voiding symptoms.展开更多
[Basckground]This case report presented a methodology for immediate implantation in the esthetic zone with a facial bone defect along with flap surgery,guided bone regeneration,and non-submerged healing.[Case presenta...[Basckground]This case report presented a methodology for immediate implantation in the esthetic zone with a facial bone defect along with flap surgery,guided bone regeneration,and non-submerged healing.[Case presentation]A 27-year-old female patient was complaining of the aesthetic complication that was caused via metallic staining of the neck of ceramic crowns in the maxillary right anterior region for one year.She has experienced immediate implantation along with flap surgery,guided bone regeneration(GBR),and non-submerged healing.The torque of the implant reached to the 35 N·cm to confirm primary stability.Six months after surgery,the healing abutment and the implant were fixed,the gingiva was healthy in the surgical area,and the nearby teeth and the opposite teeth were normal.[Results]The results of cone-beam computer tomography(CBCT)revealed that bone defects were filled with the newly formed bone.At the same time,the final impressions accomplished,and an all-ceramic crown was fit-placed.As a whole,the patient satisfaction rate was high.[Conclusions]Immediate implant placement with flap surgery,GBR,and non-submerged healing with a facial bone wall defect in the esthetic zone is an achievable process.展开更多
Peutz-Jeghers syndrome(PJS)is a polygenic autosomal dominant disease characterized by multiple gastrointestinal polyps and pigmentation of the mucosa and skin.While there are a few reports regarding successful treatme...Peutz-Jeghers syndrome(PJS)is a polygenic autosomal dominant disease characterized by multiple gastrointestinal polyps and pigmentation of the mucosa and skin.While there are a few reports regarding successful treatment of intestinal polyps in PJS,there is little research regarding treatment of mucocutaneous melanosis.This study investigated the many advantages of using a Q-switched alexandrite laser to treat mucocutaneous melanosis.In this case,a 19-year-old male with PJS presented with labial lentigines and received two Q-switched alexandrite laser treatments in 2018.Subsequently,the efficacy of the treatment was evaluated.The result of the evaluation was that,after the two laser treatments,the labial lentigines were successfully removed,and there were no complications.展开更多
Objective: The purpose of this study was to examine the effects of continuous gum chewing exercise on perioral muscle strength. Methods: Thirty healthy adults (24.1 ± 2.0 years) with normal occlusion performed gu...Objective: The purpose of this study was to examine the effects of continuous gum chewing exercise on perioral muscle strength. Methods: Thirty healthy adults (24.1 ± 2.0 years) with normal occlusion performed gum chewing exercise 3 times daily for 3 months. Each exercise session lasted 5 min and involved alternating of chewing 10 times using the left molars and then 10 times using the right molars, with the mouth closed. The effect of the exercise on oral function was evaluated by measuring tongue pressure (TP), cheek pressure (CP), and labial closure strength (LCS) immediately before starting exercise, at 2 weeks and 1, 2, and 3 months after starting exercise, and at 3 months after cessation of exercise. Changes in TP, CP, and LCS according to sex and duration of exercise were analyzed by repeated two-way ANOVA. Results: Measurements for all muscles were significantly greater in men than in women at all time points. After starting exercise, TP was markedly increased at 2 months in men and women, and both CP and LCS were markedly increased at 2 weeks in men and at 1 month in women. These effects persisted for 3 months. Three months after cessation of exercise, TP, CP, and LCS tended to decrease, but were not significantly attenuated as compared with 3 months after beginning of exercise in either sex. Conclusion: The results of this study revealed that gum chewing exercise contributed to an improvement in perioral muscle strength, and that this effect was maintained for at least 3 months after discontinuation of exercise.展开更多
目的探讨干燥综合征(Sjögren’s syndrome,SS)下唇唾液腺MRI特征及其诊断效能。材料与方法回顾性分析232例临床可疑SS患者的临床及下唇唾液腺MRI检查资料,按2016年美国风湿病学会/欧洲抗风湿病联盟共同制订的SS分类标准分为SS组(15...目的探讨干燥综合征(Sjögren’s syndrome,SS)下唇唾液腺MRI特征及其诊断效能。材料与方法回顾性分析232例临床可疑SS患者的临床及下唇唾液腺MRI检查资料,按2016年美国风湿病学会/欧洲抗风湿病联盟共同制订的SS分类标准分为SS组(155例)与非干燥综合征(non-Sjögren’s syndrome,NS)组(77例)。观察下唇唾液腺T1WI、T2WI-非对称回波的最小二乘估算法迭代水脂分离(iterative decomposition of water and fat with echo asymmetric and least-squares estimation,IDEAL)水相影像特征(腺体体积、脂肪含量、信号特点)。基于T2WI-IDEAL水相应用ITK-SNAP软件测量、计算下唇唾液腺体积、信号强度的均值和标准差,并行单因素和多因素分析,通过二元logistic回归建立多因素联合预测模型,应用受试者工作特征(receiver operating characteristic,ROC)曲线评价独立影响因素及联合预测模型对SS的诊断效能。结果SS组与NS组分别有48例、12例患者下唇唾液腺MRI表现为腺体萎缩伴腺体间脂肪组织增多,T2WI-IDEAL水相信号不均匀减低,组间差异有统计学意义(χ^(2)=5.316,P=0.023)。下唇唾液腺体积、信号强度标准差的组间差异有统计学意义(Z=-3.260、-2.803;P=0.001、0.005),是SS的独立影响因素(OR=0.999、1.014;P=0.001、0.003),预测SS的曲线下面积(area under the curve,AUC)分别为0.629[95%置信区间(confidence internal,CI):0.553~0.704]、0.613(95%CI:0.534~0.692),两者联合预测模型的AUC值为0.682(95%CI:0.608~0.756)。结论SS下唇唾液腺MRI特征为腺体萎缩和信号不均,根据唇腺体积及信号强度标准差预测SS有一定诊断价值。展开更多
In the present study, we aimed to assess the effect of combined estrogen cream on young girls’ labial adhesions, and to identify the possible factors affecting the treatment outcome. We retrospectively included 123 c...In the present study, we aimed to assess the effect of combined estrogen cream on young girls’ labial adhesions, and to identify the possible factors affecting the treatment outcome. We retrospectively included 123 children with labial adhesions.Variables were collected, including treatment outcomes, conjugated estrogen usage, and dosage, whether it was combined with manual or surgical separation, whether to use erythromycin, and whether to be accompanied with vulvitis. Chi-square test, Fisher’s exact test, and t-test were used to analyze the correlation between influencing factors and treatment outcome in univariate analysis.We used logistic regression analysis to explore the key influencing factors. The use of conjugated estrogen in combination with manual or surgical separation(P = 0.001), and the degree of labial adhesions(P = 0.011) had significant effects on the final treatment outcome.The frequency of conjugated estrogen treatment, whether erythromycin was used in combination during treatment, and whether the children were accompanied by vulvitis had no significant effect on the treatment outcome(P > 0.05). After the logistic regression,we found that whether it was combined with manual or surgical separation(P = 0.000, OR = 0.078, 95% CI = 0.030–0.203), and the degree of labial adhesions in children(P = 0.003, OR = 5.324, 95% CI = 1.767–16.041) were independently related to the effect of conjugated estrogen treatment. The therapeutic effect of conjugated estrogen alone was better for mild adhesion. However,severe adhesions need to consider with manual or surgical separation in combination with conjugated estrogen treatment. It is not recommended to combine erythromycin with routine clinical treatment. Conjugated estrogen once a day can also achieve a good therapeutic effect.展开更多
The cuticular sensory receptors that are found on the apex of the labium of hemipterans play an important role in their feeding behavior. In this study we describe the ultrastructure, number, and distribution of sensi...The cuticular sensory receptors that are found on the apex of the labium of hemipterans play an important role in their feeding behavior. In this study we describe the ultrastructure, number, and distribution of sensilla on the labium apex of the chinch bug, Blissus leucopterus leucopterus. Each apical field of sensilla on the labium contains 11 uniporous peg sensilla and one sensillum chaeticum. The uniporous peg sensilla are innervated by 4-5 bipolar neurons that send dendrites in the lumen of each peg. Three neurons are associated with each sensillum chaeticum, two neurons have dendrites in the lumen of the sensillum, and the third dendrite ends in a tubular body at the base of the sensillum. Behavioral tests that involve chemical blockage of the sensory receptors show the importance of the labial sensilla in feeding behavior. Both morphological and behavioral evidence indicate that the labial sensilla have a chemosensitive function.展开更多
Social parasitic Hymenopterans have evolved morphological, chemical, and behavioral adaptations to overcome the sophisticated recognition and defense systems of their social host to invade host nests and exploit their...Social parasitic Hymenopterans have evolved morphological, chemical, and behavioral adaptations to overcome the sophisticated recognition and defense systems of their social host to invade host nests and exploit their worker force. In bumblebees, so- cial parasitism appeared in at least 3 subgenera independently： in the subgenus Psithyrus consisting entirely of parasitic species, in the subgenus Alpinobombus with Bombus hy- perboreus, and in the subgenus Thoracobombus with B. inexspectatus. Cuckoo bumblebee males utilize species-specific cephalic labial gland secretions for mating purposes that can impact their inquiline strategy. We performed cephalic labial gland secretions in B. hyperboreus, B. inexspectatus and their hosts. Males of both parasitic species exhibited high species specific levels of cephalic gland secretions, including different main com- pounds. Our results showed no chemical mimicry in the cephalic gland secretions between inquilines and their host and we did not identify the repellent compounds already known in other cuckoo bumblebees.展开更多
文摘Objective:To investigate the clinical effect of the guided bone regeneration(GBR)technique combined with temporary bridgework-guided gingival contouring in treating upper anterior tooth loss with labial bone defects.Methods:From July 2023 to April 2024,80 patients with upper anterior tooth loss and labial bone defects were admitted to the hospital and selected as evaluation samples.They were divided into an observation group(n=40)and a control group(n=40)using a numerical table lottery scheme.The control group received treatment with the GBR technique,while the observation group received treatment with the GBR technique combined with temporary bridges to guide gingival contouring.The two groups were compared in terms of clinical red aesthetic scores(PES),labial alveolar bone density,labial bone wall thickness,gingival papillae,gingival margin levels,and patient satisfaction.Results:The PES scores of patients in the observation group were higher than those in the control group after surgery(P<0.05).The bone density of the labial alveolar bone and the thickness of the labial bone wall in the observation group were higher than those in the control group.The levels of gingival papillae and gingival margins were lower in the observation group after surgery(P<0.05).Additionally,patient satisfaction in the observation group was higher than in the control group(P<0.05).Conclusion:The GBR technique combined with temporary bridge-guided gingival contouring for treating upper anterior tooth loss with labial bone defects can improve the aesthetic effect of gingival soft tissue,increase alveolar bone density and the thickness of the labial bone wall,and enhance patient satisfaction.This approach is suitable for widespread application in healthcare institutions.
文摘Labial agglutination occurs when the labia minora have become fused in the midline through either filmy or dense adhesions, forming a raphe. This condition is typically seen in pre-pubertal girls;however, there have been cases reported in the literature of labial agglutination in postmenopausal and reproductive aged women. Labial agglutination has been associated with local irritation and inflammation in the setting of a hypoestrogenic state. Topical treatment is usually recommended prior to manual separation. However, some postmenopausal women have been refractory to conservative management, and surgery may then be required. We present a case of a 79-year-old Caucasian gravida 3 para 3 who was referred for treatment refractory labial agglutination for 3 years. The patient’s complaints included a small trickle escaping from the introitus during urination and the sensation of little urinary control. The patient underwent an exam under anesthesia. Gentle blunt dissection with a lacrimal dilator easily separated the labia minora down the visible midline fusion line (raphe). Bimanual exam then revealed a 12-week-sized enlarged uterus confirmed on ultrasound to be an 8 × 8 × 7 cm irregular mass concerning for uterine cancer. Proceeding to an operative release of severe labial agglutination can relieve patient discomfort and frustration when estradiol therapy has failed. In addition to alleviating symptoms, releasing labial agglutination can also provide the gynecologist access to critical screening procedures such as cervical cytology or a bimanual exam, all of which could lead to a diagnosis or pre-cancerous or cancerous lesions.
基金Supported by the Deanship of Scientific Research at Princess Nourah Bint Abdulrahman University Through the Fast-Track Research Funding Program.
文摘BACKGROUND Hemangioma is a vascular benign tumour of endothelial origin.It appears commonly in the first decade of life with increases incidence in females.Hemangioma is not common to happen in the oral cavity and it is extremely rare to appear in the labial vestibule.CASE SUMMARY We present a case of an 11-year-old girl who complained of a painful,slowly growing mass which was consistent with the capillary hemangioma in the left mandibular vestibule.Vascular tumor such as hemangioma in the mandibular vestibule is extremely rare;hence,the clinical definitive diagnosis is very challenging.Therefore,radiographic imaging and histopathologic analysis are crucial to reach to the final diagnosis for proper management.CONCLUSION Comprehensive clinical evaluation,proper diagnostic imaging and microscopic analysis of the mass establish a precise diagnosis of the hemangioma for better management.
文摘Adhesions of the labia are extremely rare in the reproductive population with only a few cases described in the literature. We report a young female patient with coital and voiding difficulty. The patient was a 22-year-old woman presented with voiding difficulty and inability to achieve sexual intercourse. Clinical examination revealed normally developed labia majora, clitoris, and vaginal opening, but fused labia minora and pinhole external urethral orifice. Intraoperatively, labial fusion was dissected with sharp dissection. Urethral dilatation was performed with dittel dilators. Local estrogen ointment was administered postoperatively for four weeks resulting with complete resolution of coital and voiding symptoms.
文摘[Basckground]This case report presented a methodology for immediate implantation in the esthetic zone with a facial bone defect along with flap surgery,guided bone regeneration,and non-submerged healing.[Case presentation]A 27-year-old female patient was complaining of the aesthetic complication that was caused via metallic staining of the neck of ceramic crowns in the maxillary right anterior region for one year.She has experienced immediate implantation along with flap surgery,guided bone regeneration(GBR),and non-submerged healing.The torque of the implant reached to the 35 N·cm to confirm primary stability.Six months after surgery,the healing abutment and the implant were fixed,the gingiva was healthy in the surgical area,and the nearby teeth and the opposite teeth were normal.[Results]The results of cone-beam computer tomography(CBCT)revealed that bone defects were filled with the newly formed bone.At the same time,the final impressions accomplished,and an all-ceramic crown was fit-placed.As a whole,the patient satisfaction rate was high.[Conclusions]Immediate implant placement with flap surgery,GBR,and non-submerged healing with a facial bone wall defect in the esthetic zone is an achievable process.
文摘Peutz-Jeghers syndrome(PJS)is a polygenic autosomal dominant disease characterized by multiple gastrointestinal polyps and pigmentation of the mucosa and skin.While there are a few reports regarding successful treatment of intestinal polyps in PJS,there is little research regarding treatment of mucocutaneous melanosis.This study investigated the many advantages of using a Q-switched alexandrite laser to treat mucocutaneous melanosis.In this case,a 19-year-old male with PJS presented with labial lentigines and received two Q-switched alexandrite laser treatments in 2018.Subsequently,the efficacy of the treatment was evaluated.The result of the evaluation was that,after the two laser treatments,the labial lentigines were successfully removed,and there were no complications.
文摘Objective: The purpose of this study was to examine the effects of continuous gum chewing exercise on perioral muscle strength. Methods: Thirty healthy adults (24.1 ± 2.0 years) with normal occlusion performed gum chewing exercise 3 times daily for 3 months. Each exercise session lasted 5 min and involved alternating of chewing 10 times using the left molars and then 10 times using the right molars, with the mouth closed. The effect of the exercise on oral function was evaluated by measuring tongue pressure (TP), cheek pressure (CP), and labial closure strength (LCS) immediately before starting exercise, at 2 weeks and 1, 2, and 3 months after starting exercise, and at 3 months after cessation of exercise. Changes in TP, CP, and LCS according to sex and duration of exercise were analyzed by repeated two-way ANOVA. Results: Measurements for all muscles were significantly greater in men than in women at all time points. After starting exercise, TP was markedly increased at 2 months in men and women, and both CP and LCS were markedly increased at 2 weeks in men and at 1 month in women. These effects persisted for 3 months. Three months after cessation of exercise, TP, CP, and LCS tended to decrease, but were not significantly attenuated as compared with 3 months after beginning of exercise in either sex. Conclusion: The results of this study revealed that gum chewing exercise contributed to an improvement in perioral muscle strength, and that this effect was maintained for at least 3 months after discontinuation of exercise.
文摘目的探讨干燥综合征(Sjögren’s syndrome,SS)下唇唾液腺MRI特征及其诊断效能。材料与方法回顾性分析232例临床可疑SS患者的临床及下唇唾液腺MRI检查资料,按2016年美国风湿病学会/欧洲抗风湿病联盟共同制订的SS分类标准分为SS组(155例)与非干燥综合征(non-Sjögren’s syndrome,NS)组(77例)。观察下唇唾液腺T1WI、T2WI-非对称回波的最小二乘估算法迭代水脂分离(iterative decomposition of water and fat with echo asymmetric and least-squares estimation,IDEAL)水相影像特征(腺体体积、脂肪含量、信号特点)。基于T2WI-IDEAL水相应用ITK-SNAP软件测量、计算下唇唾液腺体积、信号强度的均值和标准差,并行单因素和多因素分析,通过二元logistic回归建立多因素联合预测模型,应用受试者工作特征(receiver operating characteristic,ROC)曲线评价独立影响因素及联合预测模型对SS的诊断效能。结果SS组与NS组分别有48例、12例患者下唇唾液腺MRI表现为腺体萎缩伴腺体间脂肪组织增多,T2WI-IDEAL水相信号不均匀减低,组间差异有统计学意义(χ^(2)=5.316,P=0.023)。下唇唾液腺体积、信号强度标准差的组间差异有统计学意义(Z=-3.260、-2.803;P=0.001、0.005),是SS的独立影响因素(OR=0.999、1.014;P=0.001、0.003),预测SS的曲线下面积(area under the curve,AUC)分别为0.629[95%置信区间(confidence internal,CI):0.553~0.704]、0.613(95%CI:0.534~0.692),两者联合预测模型的AUC值为0.682(95%CI:0.608~0.756)。结论SS下唇唾液腺MRI特征为腺体萎缩和信号不均,根据唇腺体积及信号强度标准差预测SS有一定诊断价值。
基金National Natural Science Foundation of China (Grant No. 81603203)Health Commission of Guangdong Province (Grant No. A2016400)+1 种基金Guangdong Pharmaceutical Association Program (Grant No. 2015FS10 and 2015SW05)Guangzhou Institute of Pediatrics/Guangzhou Women and Children’s Medical Center (Grant No. YIP-2018-020)。
文摘In the present study, we aimed to assess the effect of combined estrogen cream on young girls’ labial adhesions, and to identify the possible factors affecting the treatment outcome. We retrospectively included 123 children with labial adhesions.Variables were collected, including treatment outcomes, conjugated estrogen usage, and dosage, whether it was combined with manual or surgical separation, whether to use erythromycin, and whether to be accompanied with vulvitis. Chi-square test, Fisher’s exact test, and t-test were used to analyze the correlation between influencing factors and treatment outcome in univariate analysis.We used logistic regression analysis to explore the key influencing factors. The use of conjugated estrogen in combination with manual or surgical separation(P = 0.001), and the degree of labial adhesions(P = 0.011) had significant effects on the final treatment outcome.The frequency of conjugated estrogen treatment, whether erythromycin was used in combination during treatment, and whether the children were accompanied by vulvitis had no significant effect on the treatment outcome(P > 0.05). After the logistic regression,we found that whether it was combined with manual or surgical separation(P = 0.000, OR = 0.078, 95% CI = 0.030–0.203), and the degree of labial adhesions in children(P = 0.003, OR = 5.324, 95% CI = 1.767–16.041) were independently related to the effect of conjugated estrogen treatment. The therapeutic effect of conjugated estrogen alone was better for mild adhesion. However,severe adhesions need to consider with manual or surgical separation in combination with conjugated estrogen treatment. It is not recommended to combine erythromycin with routine clinical treatment. Conjugated estrogen once a day can also achieve a good therapeutic effect.
文摘The cuticular sensory receptors that are found on the apex of the labium of hemipterans play an important role in their feeding behavior. In this study we describe the ultrastructure, number, and distribution of sensilla on the labium apex of the chinch bug, Blissus leucopterus leucopterus. Each apical field of sensilla on the labium contains 11 uniporous peg sensilla and one sensillum chaeticum. The uniporous peg sensilla are innervated by 4-5 bipolar neurons that send dendrites in the lumen of each peg. Three neurons are associated with each sensillum chaeticum, two neurons have dendrites in the lumen of the sensillum, and the third dendrite ends in a tubular body at the base of the sensillum. Behavioral tests that involve chemical blockage of the sensory receptors show the importance of the labial sensilla in feeding behavior. Both morphological and behavioral evidence indicate that the labial sensilla have a chemosensitive function.
文摘Social parasitic Hymenopterans have evolved morphological, chemical, and behavioral adaptations to overcome the sophisticated recognition and defense systems of their social host to invade host nests and exploit their worker force. In bumblebees, so- cial parasitism appeared in at least 3 subgenera independently： in the subgenus Psithyrus consisting entirely of parasitic species, in the subgenus Alpinobombus with Bombus hy- perboreus, and in the subgenus Thoracobombus with B. inexspectatus. Cuckoo bumblebee males utilize species-specific cephalic labial gland secretions for mating purposes that can impact their inquiline strategy. We performed cephalic labial gland secretions in B. hyperboreus, B. inexspectatus and their hosts. Males of both parasitic species exhibited high species specific levels of cephalic gland secretions, including different main com- pounds. Our results showed no chemical mimicry in the cephalic gland secretions between inquilines and their host and we did not identify the repellent compounds already known in other cuckoo bumblebees.
