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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- Fall '10
- Anatomy, Digestive System, Cardiac plexus, esophageal plexus