英语语法分析

Under normal conditions some catecholaminergic fibers innervate primary afferent neurons and there is no significant functional communication between sympathetic fibers and sensory neurons.

在正常生理条件下，初级感觉传入神经元上存在一些儿茶酚胺能神经纤维的支配，二者之间没有明显的功能联系。