What is the name of the small protruding convex prominence lateral to the end of the lip closure line?

The small protruding convex prominence lateral to the end of the lip closure line is known as the angulus oris eminence. It represents the rounded sides of the mouth that help to define the lips' curvature and are important in both aesthetics and function. This anatomical feature plays a role in the emotional expressions of the face, as well as in speech and eating.

Understanding the anatomy of the lips and surrounding structures is particularly important in the context of cosmetic work and restorative art in mortuary science, as it can affect the overall appearance of the deceased.

The other options primarily refer to different anatomical structures: the philtrum is the vertical groove between the nose and the upper lip; the labial frenulum is the connective tissue that attaches the lip to the gums; and the commissure refers to the point where the upper and lower lips meet. Each of these has its own significance but does not correspond to the specific prominence lateral to the closure line.