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到底是神经末梢汇总成轴突,还是轴突分支成神经末梢啊?!神经冲动不是轴突传到末梢吗?难道会反过来吗?
追答传入神经:末梢汇成轴突
传出神经:轴突发散成末梢。比如发散成神经-肌接头
周围神经系统的轴突分为感觉纤维和运动纤维,都是轴突。
要是你还不能理解,给你贴一段wiki:
1.motor的:
Glutamate released from the upper motor neurons triggers depolarization in
the lower motor neurons in the anterior grey column, which in turn causes an
action potential to propagate the length of the axon to the neuromuscular
junction where acetylcholine is released to carry the signal across the
synaptic cleft to the postsynaptic receptors of the muscle cell membrane,
signaling the muscle to contract。
2.sensory的:
In certain sensory neurons (pseudounipolar neurons), such as those for
touch and warmth, the electrical impulse travels along an axon from the
periphery to the cell body, and from the cell body to the spinal cord along
another branch of the same axon.
懂了吧。
你就记住轴突就一根长电线,接受信息、发送信息都靠它。