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Introduction- the autonomic nervous system (ans) is a division of the peripheral nervous system that consists of: autonomic sensory neurons- blood vessels (need to communicate with each other. Integrating centers- located in the cns: autonomic motor neurons- begin in the cns go to the smooth muscle cardiac muscle and the glands. Anatomy of the autonomic motor pathway: preganglionic neuron, starts in the spinal cord and ends in the ganglion, myelinated, autonomic ganglion- mass of cell bodies outside the cns, postganglionic neuron. Lies entirely outside of the cns, begins at the ganglion: unmyelinated. Preganglionic neurons: thoracolumbar division (sympathetic division, starts in t1-t12 and goes to l3, craniosacral division (parasympathetic division) Iii, vii, ix, x: 80% comes from the iv- glossopharyngeal. 3 major groups of a ganglia: sympathetic ganglia, sympathetic trunk ganglia, prevertebral (collateral ) ganglia, lies anterior to the vertebral column. The celiac ganglion is on either side of the celiac artery just inferior to the diaphragm: 2.

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