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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 lips are covered with skin on the outside and with slippery mucous membranes on the inside of the mouth. The major lip muscle, called the orbicularis oris, allows for the lips' mobility. The reddish tint of the lips comes from underlying blood vessels. The inside portion of both lips is connected to the gums.