Philtrum
Vertical groove in the middle area of the upper lip
Philtrum
The philtrum (Latin: philtrum; from Ancient Greek φίλτρον (phíltron) 'love charm') or medial cleft is a vertical indentation in the middle area of the upper lip, common to therian mammals, extending in humans from the nasal septum to the tubercle of the upper lip. Together with a glandular rhinarium and slit-like nostrils, it is believed to constitute the primitive condition for at least therian mammals. Monotremes lack a philtrum, though this could be due to the specialised, beak-like jaws in living species.
Read on Wikipedia · Image Rick Kimpel, CC BY-SA 2.0
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