Levator labii superioris

A muscle responsible for elevating the upper lip and assisting in facial expressions.

Levator labii superioris is a small but significant muscle located in the face. It originates from the maxilla, just below the infraorbital foramen, and extends to insert into the skin of the upper lip. This muscle is primarily involved in facial expressions, playing a crucial role in movements that affect the upper lip.

Terminologia Anatomica

levator-labii-superioris

System

Muscular system

Function

The primary function of the levator labii superioris is to elevate the upper lip. This action is essential for various facial expressions, including showing surprise, disgust, or disdain. When the muscle contracts, it pulls the lip upwards, allowing for a range of emotional displays. Additionally, it works in coordination with other facial muscles to modify expressions and contribute to non-verbal communication. The levator labii superioris also assists in exposing the upper teeth, which can enhance expressions of friendliness or engagement.

Location

Levator labii superioris is situated in the facial region, specifically in the upper jaw area. It lies deep to the skin and is positioned between the zygomaticus major muscle (which helps in smiling) and the other muscles around the mouth. Its origin is found at the maxilla, just associated with the border of the orbit, allowing it to effectively influence the skin of the upper lip during movements.

Did You Know?

This muscle can contribute to expressions of emotions such as anger or contempt, showcasing its role in social interactions.
The levator labii superioris is often paired with other facial muscles, like the orbicularis oris, which encircles the mouth, for complex facial expressions.
Imbalances or conditions affecting the levator labii superioris can result in asymmetric facial expressions, highlighting its importance in facial symmetry.
In terms of anatomy, it's interesting to note that the levator labii superioris is involved in both volunteer and involuntary movements, responding to emotional stimuli.