Peripheral Nervous System (PNS)

Peripheral nerves include motor (efferent) fibers and sensory (afferent) fibers.

Nerve endings are where synapses happen.

In the somatic nervous system (SNS), single somatic efferent (motor) neurons conveys impulses from the CNS to effector organs. Cell bodies lie in the CNS, located in either the brain, brain stem, or spinal cord. Their axons leave the CNS and travel in peripheral nerves to innervate skeletal muscle.

In the autonomic nervous system (ANS), a chain of two efferent neurons connect the CNS to smooth muscle, cardiac muscle, and glands. Preganglionic (presynaptic) neurons have cell bodies in the CNS. Their axons travel in the peripheral nerves to synapse with postganglionic (postsynaptic) neurons in autonomic ganglia.

Connective Tissue Components of the Peripheral Nerves

Connective tissue organized into three components: