Dimples form due to a split zygomaticus major muscle and create skin indentations when smiling. This inherited trait has a complex, not fully understood genetic basis. Tap to read!
Zygomaticus Major Muscle
The zygomaticus major muscle is responsible for facial expressions. Especially when smiling and the formation of dimples.
Bifid Zygomaticus Major
In faces with dimples, the bundles of the zygomaticus major separate into two bundles so that the skin gets pulled inward as the muscle contracts.
Dermis and Skin Tension
When its bifid muscle contracts, dermal skin tension causes an indentation to appear. is the famous dimple that occurs upon smiling.
Genetics
Dimples are inherited mostly, but the genetics are complex, possibly dominant traits with many genetic factors involved.
Chin Dimples
Unlike cheek dimples, chin dimples stem from the incomplete fusion of the lower jaw's bone structures.
Information credits
This information is sourced from the National Institutes of Health (NIH). Always consult a qualified healthcare provider with any questions you may have regarding a medical condition or facial anatomy.