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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.
The thin strip of tissue that runs vertically from the floor of the mouth to the undersurface of the tongue is called the lingual frenulum. It tends to limit the movement of the tongue, and in some people, it is so short that it actually interferes with speaking.