Dimple
| Dimple (Gelasin) |
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| Anatomical terminology
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A dimple (also known as a gelasin[1]) is a small natural indentation in the flesh on a part of the human body, most notably in the cheek or on the chin.[2]
Characteristics
Cheek dimples when present, show up when a person makes a facial expression. A chin dimple is a small line on your chin that stays on your chin without making any facial expressions. Dimples may appear and disappear over an extended period.[3] Professor McDonald, citing limited research, concludes dimples have been mislabeled as genetically inherited and as a dominant trait.[4][5] However, the University of Utah considers dimples an "irregular" dominant trait that is probably controlled mostly by one gene but is influenced by other genes.[6]
Physiology
Dimples are a facial muscle deformity.[7] Dimples may be caused by variations in the structure of the facial muscle known as zygomaticus major. Specifically, the presence of a double or bifid zygomaticus major muscle may explain the formation of cheek dimples.[4] This bifid variation of the muscle originates as a single structure from the zygomatic bone. As it travels anteriorly, it then divides with a superior bundle that inserts in the typical position above the corner of the mouth. An inferior bundle inserts below the corner of the mouth.
See also
References
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- ↑ Am J Med Genet. 1990 Jul;36(3):376. Cheek dimples.
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