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Best Answer: The vertical groove between your upper lip and nose is known as the 'philtrum'. It allows for a greater range of lip motions than would otherwise be possible. http://en.wikipedia.org/wiki/Philtrum.
Frenuloplasty/Frenectomy. A frenum is a small muscle attachment in the mouth that extends from the lips to the gums and from the tongue to the floor of the mouth. A frenum attaching the lips to the gums is called a labial frenum. The frenum attaching the tongue to the floor of the mouth is called the lingual frenum. You can probably detect your maxillary labial frenum by placing your tongue in the space between your upper lip and your upper front teeth.