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commissures
November 29th, 2009 by admin
At the angles of the oral fissure the lips come together by means of commissures (commissurae labiorum). The skin on the lips is continuous with the mucous membrane of the mouth; extending from the upper lip to the surface of the gum (gingival) the mucous membrane forms on the midline a rather conspicuous fold, frenulum labii superioris. Frenulum labii inferioris is usually hardly noticeable. Epithelial villi (torus villosus) are seen in the region of the angle of the mouth and on the posterior margin of the vermillion border of the lip in the newborn; they help the infant to grasp and hold in the mouth the mother’s nipple during sucking.icd 10 training helps to understand.