The philtrum is a vertical groove or depression that runs from the base of the nose to the upper lip in humans. It is a distinct feature of the midline of the face. The philtrum is formed during embryonic development and is the result of the fusion of the medial nasal processes. It serves both functional and aesthetic purposes. Functionally, the philtrum helps direct the flow of fluids from the nose to the mouth, facilitating activities such as drinking and eating. Aesthetically, it contributes to the overall facial appearance, adding depth and contour to the region between the nose and upper lip. The philtrum varies in size and prominence among individuals, and its shape and characteristics can be influenced by genetic factors.

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