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7 Cards in this Set

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excitatory ENS transmitters(2)
ACh

Substance P
inhibitory ENS transmitters (7)
NE

Epi

enkephalins

somatostatin

serotonin

VIP

NO
Auerbach's (myenteric) plexus controls
motor activity along the length (longitudinal smooth muscle) of the gut
Meissner's (submucosal) plexus controls
inner wall (circular smooth muscle) small segments
GI smooth muscle contraction is stimulated by inhibition of ________
inhibitory motoeurons
(e.g., tetrodotoxin blocks inhibitory motoneurons)
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
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