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Nose Upper Lip Human Fetus, 400X sec
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. The upper lip covers the anterior surface of the body of the maxilla. Its upper half is of usual skin color and has a depression at its center, directly under the nasal septum, called the philtrum, which is Latin for lower nose, while its lower half is a markedly different, red-colored skin tone more similar to the color of the inside of the mouth, and the term vermillion refers to the colored portion of either the upper or lower lip.