circular layer of muscle coat of small intestine
Definition: the inner layer of smooth (involuntary) muscle of the muscle coat (muscularis externa) of the small intestine in which the muscle fibers encircle the lumen; it is claimed by some investigators that the orientation of the muscle fibers is a tight spiral or helix rather than being truly circular.
Synonym(s): stratum circulare tunicae muscularis intestini tenuisTA, short pitch helicoidal layer, stratum helicoidale brevis gradus
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