家兔趾长伸肌肌内神经、运动终板和肌梭的分布  

Distribution of intramuscular nerves, motor endplates and muscle spindles of extensor digitorum longus in rabbits

作　　者：杨胜波[1] 薛黔[1] 李季蓉[1] 

机构地区：[1]遵义医学院人体解剖学教研室,遵义563003

出　　处：《解剖学杂志》2005年第4期468-470,i0001,共4页Chinese Journal of Anatomy

基　　金：国家教育部科学技术研究重点课题(C-239)

摘　　要：目的:探究家兔趾长伸肌肌内神经、运动终板与肌梭的分布。方法:改良Sihler’s染色法、乙酰胆碱酯酶染色法及HE染色法。结果:趾长伸肌是短肌束构成的长肌,肌束起点高的,止点相应亦较高。连于第2趾的肌纤维占据了肌腹上1/3,止于其余3 趾的肌纤维位于下2/3。趾长伸肌的神经来自2条肌外神经干,上支及其分支支配第2趾的肌纤维,下支司其余3趾。运动终板分布除冠状切面上为弥漫的黑色颗粒外,其余各切面均为一条连续的运动终板带。各部的肌梭密度分别是:起端33.95个/g、肌腹中部44.76个/g、止端为零。结论:家兔趾长伸肌内,肌梭分布不均匀。肌内神经分支密集的部位,运动终板集聚、肌梭密度亦高。家兔趾长伸肌具有划分亚部的特征。To investigate the distribution of intramuscular nerves,motor endplates and muscle spindles of extensor digitorurn longus in rabbits. Methods： Modified Sihler＇s staining, acetylcholinesterase staining and hernatoxylin and eosin staining were used. Results： The muscle fibers inserted into the second phalange occupied the proximal 1/3 of the belly; the rest fibers occupied the distal 2/3 of the belly. The nerve innervating extensor digitorum longus came from fibular nerve. Two extramuscular nerve trunk were seen; the upper one mainly innervated muscle fibers inserted into the second toe; the other trunk mainly distributed in the muscle fibers of rest toes. Motor endplate of all sections of extensor digitorum longus was a continuous band except coronary plane on which black staining particles diffused widely. Muscle spindle density of every part of extensor digitorum longus was as follows：the origin was 33.95/g; the middle was 44. 76/g; and the insert was zero. Conclusion： Dense regions of intramuscular nerve branches has a large motor endplate and muscle spindle population. The extensor digitorum longus can be divided into compartments. Distributions of muscle spindle are asymmetric in extensor digitorum longus.

关 键 词：家兔 趾长伸肌 肌内神经 运动终板 肌梭 解剖学 

分 类 号：R322[医药卫生—人体解剖和组织胚胎学]