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Small Intestine - Anatomy & Physiology (view source)
Revision as of 08:28, 12 July 2008
, 08:28, 12 July 2008→Regulation & Control
***enkephalins
***enkephalins
*The autonomic nervous system (ANS) control is superimposed over local control.
*The autonomic nervous system (ANS) control is superimposed over local control.
**The ANS acts via the same two plexuses.
**The small intestine recieves sympathetic and parasympathetic innervation, which act via the same two plexuses.
**Parasympathetic innervation stimulates motility and secretion
**Parasympathetic innervation stimulates motility and secretion
**Sympathetic innervation antagonises the parasympathetic nervous system and inhibits motility and secretion.
**Sympathetic innervation antagonises the parasympathetic nervous system and inhibits motility and secretion.
***Sympathetic neurones have coeliac, cranial mesenteric and caudal mesenteric ganglia at the corresponding branches of the aorta.
***As the sympathetic fibres leave the ganglia, they surround the respective artery.
*Generation of action potentials is intrinsic to the smooth muscle in the intestine.
*Generation of action potentials is intrinsic to the smooth muscle in the intestine.
**'''Interstitial cells of Cajal''' act as muscle pacemakers and generate a ''basic electrical rhythm'' (BER).
**'''Interstitial cells of Cajal''' act as muscle pacemakers and generate a ''basic electrical rhythm'' (BER).