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Lower 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 theprocheilon (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 lower lip is formed from the mandibular prominence, a branch of the first pharyngeal arch. The lower lip covers the anterior body of the mandible. It is lowered by the depressor labii inferioris muscle and the orbicularis oris borders it inferiorly.