| 释义 | circular layer of muscle coat of small intestinecircular layer of muscle coat of small intestine[TA] 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 tenuis [TA], short pitch helicoidal layer ☆ , stratum helicoidale brevis gradus ☆ |