Chin: Medically, the mentum. The lower portion of the face below the lower lip including the prominence of the lower jaw and the line of fusion of the two separate halves of the jawbone (mandible). This line of fusion (called the symphysis menti) encloses a triangular area at tip of the chin (termed the mental protuberance). On each side, below the second premolar tooth, is the mental foramen, an opening for the passage of blood vessels and a nerve that supply the chin.
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Neck Questions Jul 8, 2001 I've been working my neck a lot and have seen improvement in the tigtness of "chins," however I have a new concern.
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The circulation numbers com ing out early next week from the Audit Bureau of Circulations are expected to show a particularly dismal first half of the year for the ...