ANP 1106 Lecture Notes - Lecture 19: Autonomic Nervous System, Preganglionic Nerve Fibers, Paravertebral Ganglia

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

This system consisted of motor neurons that innervate smooth and cardiac muscle and glands, and operated via subconscious control. At every moment, the autonomic nervous system makes adjustments as necessary to ensure optimal support for body activities. Most of their effectors are viscera (ie. stomach, intestine, liver, spleen, pancreas, kidney, etc. ). The autonomic nervous system uses a two-neuron chain to reach its effectors: the cell body of the first neuron (preganglionic neuron) resides in the brain or spinal cord with its preganglionic axon synapsing with the second motor neuron. Lightly myelinated axon that extends to a ganglion: the postganglionic neuron is the second motor neuron with its cell body in an autonomic ganglion outside the cns. Its axon, the postganglionic axon, extends to the effector organ. A ganglion is a collection of neuronal cell bodies in the peripherally (except for the cns basal ganglion). Dorsal root ganglia are sensory, whereas autonomic ganglia are motor neurons.