鸣鸣蝉发声肌的结构观察  

OBSERVATION ON SOUNDING MUSCLE STRUCTURE IN MINGMING CICADA

作　　者：杨新宇[1] 蒋锦昌[1] 

机构地区：[1]中国科学院生物物理研究所

出　　处：《昆虫学报》1995年第2期173-178,共6页Acta Entomologica Sinica

基　　金：国家自然科学基金

摘　　要：鸣鸣蝉ＯｎｃｏｔｙｍｐａｎａｍａｃｕｌａｔｉｃｏｌｌｉｓＭｏｔｓｃｈ的发声肌平均含１９３个初级肌束，多数初级肌束含７－１０条肌纤维，其顶、底端的附着结构仅由柱状粘和细胞层组成。每条肌纤维约含１９００根肌原纤维，多数肌原纤维的长、宽和截面分别约０．７７μｍ、０．６８μｍ和０．５３μｍ２，并约合２００根粗肌丝，其粗细肌丝的比值一般为３：１。肌小节的长度和Ｚ线的宽度分别约３μｍ和０．２μｍ．三联管分别位于距两端Ｚ线约０．７５μｍ处。肌原纤维、线粒体和微气管一肌质同的面积系数分别约３１．３％、４６．０％和１１．９％。肌小节中粗肌丝纵贯两端Ｚ线，中间无１带；细肌丝由Ｚ线相向延伸到肌小节中央，其空区约０．１５－０．２５μｍ，并无Ｍ线。这些结构特征不仅使发声肌能够利用有限的几何空间产生最大的张力，并可适应高速率的收缩运动。in the mingming cicada Oncotympana maculaticollis Motsch, thesounding muscle consists of 193 primary myobandles on average, with the majoritycontaining 7--10 muscle fibers. The sticking structures of top and bottom musclefibers consist of a layer of adhesion pillar cells. Each muscle fiber contains about1800 myofibrils, and in the majority of them the length, width and cross sectionarea are about 0.77pm, 0.68Urn and 0.53μm2, respectively. Each myofibril contains ah'out 200 thick filaments and the ratio of thin to thick filament is commonly 3:1.The sacromere length and Z--line width are about 3μm and 0.2pm respectively, andtwo triads are separately about 0.75μm distant from both ends of Z--line. The area'coefficients of myofibril, mitochondra and tracheole-sarcoplasmic reticulum are about31.3 %, 46.0 % and 11.9 % , respectively. In the sarcomere, thick filaments run throughtwo ends of the Z--line without I--band in the middle, and thin filaments stretchoppositely from two ends of Z-line to the middle and the gap is about 0.15--0.25μm. The M--line is absent. These structural characteristics not only enable the sounding muscle to make enough use of limited spaces and to produce maximal tensions,but also to adapt contraction movements of high speed.

关 键 词：鸣鸣蝉 发声肌 显微结构 发声功能 

分 类 号：Q969.351.1[生物学—昆虫学] Q967