part of part of rectum muscularis mucosae of large intestine mucosa of rectum muscularis mucosa muscularis mucosae of rectum lamina muscularis of rectal mucous membrane A muscularis mucosa that is part of a rectum. SCTID:53420003 EMAPA:27093 UBERON:0012497 FMA:15687 lamina muscularis of rectal mucosa rectum smooth muscle tissue