The basic route of the efferent somatic nervous system includes a two neuron sequence.

传出躯体经系统的基本通路包括一个经元序列。

The somatic nervous system consists of afferent fibers that receive information from external sources, and efferent fibers that are responsible for muscle contraction.

躯体经系统由接收外信息的传入纤维和负责肌肉收缩的传出纤维。

They're striated like cardiac muscle tissue, but they're also mostly voluntary, meaning you have to think about using them and activate them with your somatic nervous system.

它们像心肌织一样有条纹，但也大多是自愿的，这意味着你必须考虑使用它们，并用你的躯体经系统激活它们。

The Peripheral Nervous System. The peripheral nervous system includes 12 cranial nerves and 31 pairs of spinal nerves. It can be subdivided into the somatic and autonomic nervous systems.

3。周围经系统;周围经系统包括12条脑经和31对脊经。它可以细分为躯体经系统和自主经系统。