The sympathetic division innervates targets with nerves that all originate from the thoracolumbar region. Which plexus does NOT receive innervation from the vagus nerve? Once a preganglionic axon reaches a trunk ganglion, one of three things can happen to the axon.



Answer :

True. The sympathetic division innervates targets with nerves that all originate from the thoracolumbar region

The inferior hypogastric plexus receives nerve fibers from the pelvic splanchnic (spinal) nerves, not the vagus (cranial) nerve.

The axon can course back into the spinal cord to synapse with preganglionic neurons in a different spinal segment. Preganglionic axons do not pass back into the spinal cord.

Through connections arising from the thoracic and upper lumbar spinal cords, the sympathetic division of the autonomic important aspects the various organ systems of the body. To represent this anatomical basis, it is known as the thoracolumbar system.

In the inferior hypogastric plexus, sympathetic and parasympathetic fibers converge, where autonomic input to the peis is incorporated and conveyed to the peis via cavernosal nerves. The inferior hypogastric ganglionic plexus is situated near the rectum in man.

Preganglionic neuron axon terminals synapse on dendrites and cell bodies of postganglionic neurons. (By comparison, somatic efferent (SE) innervation of skeletal muscle includes only one neuron, the cell body of which is located in the CNS.)

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