Anatomy, Head and Neck, Lips - StatPearls - NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK507900/
WEBJun 5, 2023 · Introduction. The lips are an essential aspect of the human face and play a critical role in facial expression, phonation, sensation, mastication, physical attraction, and intimacy. The upper and lower lips are known as, respectively, labium superius oris and labium inferius oris.
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