Levator labii superioris alaeque nasi is a facial muscle that plays a critical role in raising the upper lip and dilating the nostrils, contributing to expressions of disdain or disgust. Its primary function in facial expressions makes it essential for conveying emotions and aiding in nasal breathing.
The name Levator labii superioris alaeque nasi is derived from Latin, meaning "lifter of the upper lip and wing of the nose," which accurately describes its action and anatomical positioning.
Without the Levator labii superioris alaeque nasi, the upper lip would lack mobility, significantly impairing expressions that involve upper lip elevation, such as snarling, and possibly affecting functions related to flaring the nostrils.
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