CAS BI 106 Lecture Notes - Lecture 18: Special Senses, Baroreceptor, Proprioception
22 Mar 2017
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Document Summary
Posterior horns- longer thinner and are more pointed- axons of sensory neurons and cell bodies of interneurons. Anterior horns- more fat and rounded- only cell bodies of somatic motor neurons (efferent) skeletal muscles. Lateral horns- cell bodies of autonomic motor neurons (thoracic and superior lumbar portions only) - smooth muscles. There is a posterior root and an anterior root. However there is a posterior ganglion- collection of cell bodies in the pns. 31 pairs of spinal nerves connect the spinal cord to muscles, glands and nerve receptors. Nerves arise from the spinal cord as small bundles of axons called rootlets. Immediately from the spinal nerve, there are nerves that branch off and innervate the muscles of the erector spinae. Anterior ramus- splits into multiple other branches that innervates everything else. Sometimes another ramus can branch off of the spinal nerve- communicating rami- contains axons of the ans. What comes out of the plexus are the peripheral nerves.
