LBYBIO3 Facial Expression

Occipitofrontalis

Is a muscle that covers the forehead and the back of the head, enabling movements like raising the eyebrows and wrinkling the forehead.

Corrugator supercilii

A small muscle located at the eyebrow, responsible for drawing the eyebrows downward and together, creating vertical furrows in the forehead.

Procerus + transverse part of nasalis

is a muscle of facial expression that pulls the skin between the eyebrows down and helps to create horizontal wrinkles on the bridge of the nose.

Orbicularis oculi

is a circular muscle around the eye that allows for the closing of the eyelids and helps in movements like squinting or blinking.

Lev. labii sup alaeque nasi + alar part of nasalis

are muscles that elevate the upper lip and flare the nostrils, contributing to facial expression and expressions of disdain or disbelief.

Buccinator + orbicularis oris

are muscles involved in the movement of the lips and cheeks, facilitating actions such as chewing and blowing, while contributing to facial expressions.

Zygomaticus major + minor

are muscles that elevate the corners of the mouth, playing a key role in smiling and expressing happiness.

Risorius

is a muscle that pulls the mouth's corners laterally, contributing to expressions of laughter and enjoyment.

Risorius + depressor labii inferioris

are muscles that contribute to frowning and expressions of sadness by pulling down the lower lip and corners of the mouth.

Levator labii superioris + depressor labii

inferioris are muscles involved in facial expressions, with the levator labii superioris elevating the upper lip and the depressor labii inferioris lowering the lower lip, affecting overall mouth position.

Dilators of mouth: Risorius plus levator labii superioris + depressor labii inferioris

are a group of muscles that work together to modify the size and shape of the mouth opening, facilitating various facial expressions.

Orbicularis oris

is a complex muscle that encircles the mouth, enabling the lips to pucker, close, and manipulate food during chewing and speaking.

Depressor anguli oris

is a muscle that pulls the corners of the mouth downward, contributing to expressions of sadness or frowning.

Mentalis

is a muscle located at the chin, responsible for elevating and protruding the lower lip, often associated with expressions of doubt or contempt.

Platysma

is a superficial muscle that extends from the chest and shoulder to the lower jaw, facilitating movements that lower the jaw and help create expressions of surprise or tension. It plays a role in facial expressions and can also tense the skin of the neck.