Description

The upper lip has a depression at its center, directly under the nasal septum, called the philtrum. At the extremity of the philtrum is a small elevation called the tubercle.


This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).

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