Elizalde A, Huerta M, Stefani E
J Physiol. 1983 Jul;340:513-24. doi: 10.1113/jphysiol.1983.sp014777.
The electrical properties and innervation of piriformis muscle fibres and the conduction velocities and thresholds of the corresponding motor axons were studied. In normal muscles all fibres clearly fell into the category of twitch or tonic. Tonic muscle fibres were selectively reinnervated by small motor axons after crushing or cutting the piriformis nerve. Twitch fibres were reinnervated by large motor axons. Tonic fibres were also selectively reinnervated by small motor axons when the proximal stump of the piriformis nerve was cut and attached to the caudal end of the muscle. With this procedure the possibility of mechanical guidance by remaining neural sheaths was eliminated. Polyneuronal innervation in twitch fibres in piriformis muscles of normal frogs was 4.7% and in contralateral muscles of operated frogs with the piriformis nerve cut it was 22.6%. Unexpectedly three out of seventeen tonic fibres in contralateral muscles were simultaneously innervated by both small and large motor axons. It is concluded that reinnervation is highly specific for fibre type in frog skeletal muscles.
对梨状肌纤维的电特性和神经支配以及相应运动轴突的传导速度和阈值进行了研究。在正常肌肉中，所有纤维明显可分为快肌纤维或慢肌纤维类型。在切断或切断梨状肌神经后，慢肌纤维由小运动轴突选择性地重新支配。快肌纤维由大运动轴突重新支配。当梨状肌神经的近端残端被切断并连接到肌肉的尾端时，慢肌纤维也由小运动轴突选择性地重新支配。通过这种操作，消除了剩余神经鞘进行机械引导的可能性。正常青蛙梨状肌中快肌纤维的多神经元支配率为4.7%，在梨状肌神经切断的手术青蛙的对侧肌肉中为22.6%。出乎意料的是，对侧肌肉中17条慢肌纤维中有3条同时由小运动轴突和大运动轴突支配。结论是，在青蛙骨骼肌中，重新支配对纤维类型具有高度特异性。
