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***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).
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