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16 Cards in this Set
- Front
- Back
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What is the extensive, sophisticated nervous system of the GI system?
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Enteric Nervous System
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Where is the Myenteric plexus located?
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Between circular and longitudinal muscular layers
(Auerbach's) |
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Where is the Submucosal plexus located?
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Within the submucosal layer (Meissner's)
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More interneuronal connections are associated with which plexus?
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Myenteric (auerbach's)
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Specifically, what kind of afferent receptors are found in the muscle layers?
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Mechanoreceptors
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Specifically, what kind of afferent receptors are found in the mucosa?
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Chemoreceptors
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What do enteric motor nerves "innervate"?
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Vascular muscle, gut muscle, and glands
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Do enteric motor nerves directly innervate (synapse) between the nerve and the target?
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No
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How does the ENS innervate the GI tract?
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Through branches with vesicular structures on them (varicosities) that release neurocrines in response to action potentials
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Excitatory neurons use what neurocrine transmitter?
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Achetylcholine (they are cholinergic) or Substance P is common
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What neurocrines do inhibitory neurons use?
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Mostly peptides - somatostatin is an example
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What is the parasympathetic connection for the proximal GI tract? (what nerve)
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Vagus nerve
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What is the parasympathetic connection for the terminal GI tract? (nerve)
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Pelvic n
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What aspect of the nervous system signals pathological conditions?
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splanchnic afferent nerves
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What is a hormone?
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molecule that travels through blood from site of synthesis to site of action
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What is a paracrine substance?
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molecule secreted by one cell and have local effects
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