Glossopharyngeal Nerve - Parasympathetic fibers do not...

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Autonomic Nervous System Glossopharyngeal Nerve (CN IX) * parasympathetic fibers concerned with salivation * leaves origin to form the tympanic nerve which crosses the eardrum and end at the otic ganglion * postganglionic fibers terminate at the parotid gland Vagus Nerve (CN X) * carries about 90% of all parasympathetic fibers * travels down the neck and forms three networks in the mediastinum * cardiac plexus- fibers to heart * pulmonary plexus- accompany bronchi and vessels into lungs * esophageal plexus- regulate swallowing * The remaining parasympathetic fibers arise from S2-S4 to form the pelvic splanchnic nerve that leads to the inferior hypogastric (pelvic) plexus * most fibers do not synapse here but pass on to their respective terminal ganglia in their target organs (distal half of the large intestine, the rectum, urinary bladder, and reproductive organs)
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Unformatted text preview: * Parasympathetic fibers do not innervate body wall structures (sweat glands, piloerector muscles, or cutaneous blood vessels) Enteric Nervous System * Unlike the ANS, it does not arise form the brain stem or spinal cord * Like the ANS, it innervates smooth muscles and glands * Consist of millions of neurons embedded in the wall of the digestive tract. * Forms two plexi * Myenteric plexus * Lies between layers of longitudinal and circular muscles of alimentary canal * Extends from pharynx to anus * Submucosal plexus * lies within submucosal layer of intestines, from the junction with the stomach to the anus Controls activity of gastrointestinal tract in three ways: 1) controlling intestinal peristalsis 2) modulating blood flow through gut 3) regulating the release of secretions from gastrointestinal glands...
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