ANAT 1010 Chapter Notes - Chapter 19: Inferior Mesenteric Plexus, Lumbar Splanchnic Nerves, Pelvic Splanchnic Nerves
12 Mar 2017
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Some synapse in the first ganglion at the level of entry: others pass up or down the sympathetic trunk for a variable distance to form the sympathetic chains - fibers on which the ganglia are strung. From all ganglia of sympathetic chain - they return via gray communicating rami to the anterior ramus of a spinal nerve where they are distributed to blood vessels, sweat glands, and arrector pili muscles in the body wall. From cervical sympathetic chain ganglia, they exit into nerve branches that supply the heart or that follow blood vessels into the head, neck, and shoulder region. In the skin, these neurons also innervate blood vessels, sweat glands, and arrector pili muscles of hair follicles. Lumbar portion of each sympathetic trunk ganglion lies lateral to the corresponding lumbar vertebrae. Four major prevertebral ganglia: celiac ganglion - either side of celiac artery just inferior to the diaphragm.
