muscularis

noun
mus·​cu·​la·​ris | \ˌməs-kyə-ˈlar-əs \

Medical Definition of muscularis 

1 : the smooth muscular layer of the wall of various more or less contractile organs (as the bladder)

2 : the thin layer of smooth muscle that forms part of a mucous membrane (as in the esophagus)

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