腭帆提肌运动神经支配的实验研究

Experimental study of motor nerve innervation of levator veli palatini.

目的 探讨腭帆提肌运动神经的来源及走行路径。方法 :以兔为研究对象 ,应用辣根过氧化物酶 (HorseridishPerosidase,HRP)逆行追踪技术 ,结合使用颅内的脑神经根切断术。结果 :腭帆提肌的运动神经元位于同侧脑干的疑核中 ;面神经核内未见标记的神经元 ;当副神经的延脑根被切断后 ,同侧脑干疑核内的标记神经元消失。结论 :腭帆提肌是由疑核内运动神经元轴突 ,经副神经延脑根出颅 ,再经迷走神经咽支进行支配的。

Objective:To investigate the motor nerve innervation of levator veli palatini(LVP). Methods:Materials consisted of 12 healthy male rabbits. Horseridish peroxidase(HRP) retrograde tracing technique was applied to locate the motoneurons of LVP. Then in conjunction with selective intracanial severing of cranialnerve rootlets, the peripheral courses of LVP was emphasized. Results: Following HRP injection into LVP,labeled motoneurons were ipslaterally located in the rostal section of nucleus ambiguns. No labeled motoneurons were found in the facial nucleus. After the cranial rootlets of the accessory nerve were intracranyally severed, labeled motoneurons were commpleltly abolished. Conclusion:LVP was innervated by the motoneurons in the nucleus ambiguus. The axons of those motoneurons came out of the cranium through the cranium through the cranial rootlet of the accessory nerve, then join the vagus to be distributed via the pharyngela branches of vagus.