Humans are under certain biological constraints, which is why we can express happiness and joy only by activating musculus zygomaticus major.
Specifically, the presence of a double or bifid zygomaticus major muscle may explain the formation of cheek dimples.
Anatomically, dimples may be caused by variations in the structure of the facial muscle known as zygomaticus major.
Dimples may be caused by variations in the structure of the facial muscle known as zygomaticus major.
Four such muscles that were activated were the orbicularis oculi, zygomaticus, the corrugator, and levator.
Sometimes fibers can be traced to the zygomaticus, or to the margin of the orbicularis oris.
Zygomaticus major shown in red.
