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Cards In This Set
| Front | Back |
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Where is the enteric nervous system located?
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In the wall (intramural) of the GIT
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What structures form the ENS?
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1. Intramural ganglia (nerve cell bodies) 2. Intramural plexus
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Is the ENS independent or regulated by the brain?
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Independent
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How many intramural nervous plexuses are there within the ENS?
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Two - connected to the CNS by GVA and sympathetic/parasympathetic efferent fibres
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Name the intramural plexus within the lamina submucosa
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Submucosal nerve plexus
(aka Meissner plexus) |
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Name the intramural plexus located between the circular and longitudinal muscle layers
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Myenteric nerve plexus
(aka Auerbach plexus) |
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List the defining features of an intramural ganglion
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A) Large cellsb) Basophilic cytoplasm (blue due to Nissl substance)c) Big nucleus with prominent nucleolus
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State the main function of the myenteric/Auerbach plexus
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Regulation of contractions
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What is the main function of the submucosal/Meissner plexus?
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It interacts with the mucose to regulate the action of secretory cells
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The enteric nervous system is part of the autonomic nervous system - true or false?
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True
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What is the main function of the ENS?
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It integrates: 1. motility2. secretions3. blood flow
...into organised patterns through neural reflexes
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The term for local contractions which mix the contents of the intestine is...
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Segmentation
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Wave-like contractions which take place along the axis with the aim of transporting the contents are known as...
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Peristalsis
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Peristalsis is faciliated by excitatory fibres with project in the aboral direction and inhibitory fibres which project in the oral direction - true or false?
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False: Excitatory = oral direction Inhibitory = aboral direction
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What is the function of the interstitial cells of Cajal?
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They are modified smooth muscle cells which function as a pacemaker for gut contraction
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