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7 Cards in this Set
- Front
- Back
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excitatory ENS transmitters(2)
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ACh
Substance P |
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inhibitory ENS transmitters (7)
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NE
Epi enkephalins somatostatin serotonin VIP NO |
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Auerbach's (myenteric) plexus controls
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motor activity along the length (longitudinal smooth muscle) of the gut
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Meissner's (submucosal) plexus controls
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inner wall (circular smooth muscle) small segments
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GI smooth muscle contraction is stimulated by inhibition of ________
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inhibitory motoeurons
(e.g., tetrodotoxin blocks inhibitory motoneurons) |
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ANS excitation of ENS
*PNS *SNS |
*PNS: pre-ganglionic parasympathetics from vagus n. and/or pelvic n. synapse on post-ganglionic cholinergic neurons in Auerbach's & Meissner's plexuses
*SNS: post-ganglionic sympathetic adrenergic fibers innervate terminal rectum and ileo-colic sphincter |
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ANS inhibition of ENS
*PNS *SNS |
*PNS: pre-ganglionic parasympathetics from vagus n. synapse on post-ganglionic non-adrenergic inhibitory neurons
-secrete NO (major) and VIP (minor) originating in Auerbach's & Meissners' plexuses and terminating in muscle *SNS: Post-ganglionic sympathetic adrenergic fibers terminate on cholinergic ganglia in Auerbach's & Meissner's plexuses |
