Lips are a visible body part at the mouth
of humans and many animals. Lips are soft, movable, and serve as the
opening for food intake and in the articulation of sound and speech.
Human lips are a tactile sensory organ, and can be erogenous when used
in kissing and other acts of intimacy.
The upper and lower lips are referred to as the "Labium superius oris"
and "Labium inferius oris", respectively. The juncture where the lips
meet the surrounding skin of the mouth
area is the vermilion border, and the typically reddish area within the
borders is called the vermilion zone. The vermilion border of the upper
lip is known as the cupid's bow. The fleshy protuberance located in the
center of the upper lip is a tubercle known by various terms including
the procheilon (also spelled prochilon), the "tuberculum labii
superioris", and the "labial tubercle". The vertical groove extending
from the procheilon to the nasal septum is called the philtrum.
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