15.5 Autonomic Plexuses and Enteric Nervous System

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7 Terms

1
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autonomic plexuses

networks of nerves within thoracic and abdominopelvic cavities

  • contain symp post axons, parasymp pre axons, and some visceral sensory axons

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cardiac plexus

includes:

  • sympathetic axons from cervical and thoracic trunk (quicken heart rate)

  • parasympathetic axons from vagus nerve (slow the heart)

<p>includes:</p><ul><li><p><strong>sympathetic </strong>axons from cervical and thoracic trunk <strong>(quicken heart rate)</strong></p></li></ul><ul><li><p><strong>parasympathetic </strong>axons from vagus nerve <strong>(slow the heart)</strong></p></li></ul><p></p>
3
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pulmonary plexus

includes:

  • sympathetic axons from cervical and thoracic trunk (bronchodilation)

  • parasympathetic axons from vagus nerve (bronchoconstriction)

<p>includes:</p><ul><li><p><strong>sympathetic </strong>axons from cervical and thoracic trunk <strong>(bronchodilation)</strong></p></li><li><p><strong>parasympathetic </strong>axons from vagus nerve <strong>(bronchoconstriction)</strong></p></li></ul><p></p>
4
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esophageal

includes:

  • sympathetic axons from cervical and thoracic trunk (decrease motility)

  • parasympathetic axons from vagus nerve (coordinate opening of cardiac sphincter with swallowing)

<p>includes:</p><ul><li><p><strong>sympathetic </strong>axons from cervical and thoracic trunk <strong>(decrease motility)</strong></p></li><li><p><strong>parasympathetic </strong>axons from vagus nerve <strong>(coordinate opening of cardiac sphincter with swallowing)</strong></p></li></ul><p></p>
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abdominal aortic plexus

  • consists of celiac (solar) plexus, superior mesenteric plexus, and inferior mesenteric plexus

    • sympathetic post axons from prevertebral ganglia

    • parasympathetic pre axons from vagus nerve or pelvic splanchnic nerves

  • innervates all abdominal and some pelvic organs

<ul><li><p>consists of <strong>celiac (solar) plexus, superior mesenteric plexus, and inferior mesenteric plexus</strong></p><ul><li><p><strong>sympathetic post </strong>axons from prevertebral ganglia</p></li><li><p><strong>parasympathetic pre </strong>axons from vagus nerve or pelvic splanchnic nerves</p></li></ul></li><li><p>innervates<strong> all abdominal and some pelvic organs</strong> </p></li></ul><p></p>
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hypogastric plexus

  • sympathetic axons from aortic plexus and symp. trunk

  • parasympathetic axons from pelvic splanchnic nerves

    • both innervate viscera within pelvic region (rep. organs)

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enteric nervous system

autonomic motor and visceral sensory neurons arranged throughout wall of GI tract

  • innervates smooth muscle and glands

  • coordinates peristalsis, movement of materials through GI tract

  • includes two large plexuses

    • submucosal plexus

    • myenteric plexus

  • para increases ENS activity, and symp inhibits ENS

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