NCIt definition : The lining of the fleshy folds surrounding the mouth. It is comprised of the epithelium,
basement membrane, lamina propria mucosae, and lamina muscularis mucosae.;
Alternative definition : CDISC: The lining of the fleshy folds surrounding the mouth. It is comprised of the
epithelium, basement membrane, lamina propria mucosae, and lamina muscularis mucosae.
(NCI); NCI-GLOSS: The inner lining of the lips.;