家兔不同形态骨骼肌的肌内神经分布

THE DISTRIBUTION OF INTRAMUSCULAR NERVESIN DIFFERENT SKELETAL MUSCLES OF THE RABBIT

目的探讨家兔不同形态骨骼肌的肌内神经分支分布。方法肌构筑法和改良的Sihler肌内神经染色法。结果清楚显示扁形的胸大肌接受胸前神经和胸后神经支配。胸前神经主要支配横行纤维,并在其中部形成一“U”形的神经襻。胸后神经主要支配斜行纤维,与前者的神经细分支间有吻合;羽状的跖肌由胫神经肌支支配,入肌后逐渐向肌的内、外两侧发出许多初级神经支,这些神经支又分出若干树枝状的次级支与细分支;梭形的趾长伸肌,有2条肌外神经干,上干及其分支支配止于第二趾的肌纤维,下干支配其余3趾的肌纤维。结论不同形态肌的肌内神经分支、分布与肌纤维排列有关;肌内神经分支走行有与肌束平行和/或垂直两种形式。

Objective To investigate the distribution of intramuscular nerves in the different skeletal muscles of the rabbit. Methods Muscle architecture and modified sihler＇ s neural staining methods were used. Results The nerve branches of innervating flat M. pectoralis major arose from the anterior pectoral and posterior pectoral nerve. The former innervated cross fibers mainly,it penetrated the middle of muscle belly and formed a ＂U-Shaped＂ nerve ansa. The latter innervated oblique fibers mainly. There were many anastomoses between them.The nerve of pennate M. plantaris derived from tibial nerve. After entering muscle,the nerve trunk gradually divided into many primary branches toward medial and lateral fibers,these branches then subdivided into numerous arboroid second and terminal branches toward all of muscle fibres ; The nerve of innervating spindle M. extensor digitorum longus came from N. fibularis communis. Two extramuscular nerve trunk were seen. Superior trunk mainly innervated those muscle fibers of inserting in the second toe, Inferior one mainly distributed to the fibers of rest within this muscle. Conclusion The spatial arrangement of the muscle fibres were related to distribution of the intramuscular nerves ; Walking of intramuscular nerve branches had two patterns which run perpendicular and/or parallel to muscle fasciculi.