Transverse muscle of the chin

Transverse Muscle of the Chin

Illustration of the transverse muscle of the chin, also known as the mentalis muscle. Image courtesy of Wikimedia Commons.

The Transverse Muscle of the Chin, also known as the Mentalis Muscle, is a paired central muscle located on the human chin. It is one of the muscles of the lower lip and chin, playing a significant role in facial expressions and movements.

Anatomy

The transverse muscle of the chin originates from the mandible's incisive fossa and inserts into the skin of the chin. It is innervated by the marginal mandibular branch of the facial nerve.

Function

The primary function of the transverse muscle of the chin is to elevate and protrude the lower lip, causing the skin of the chin to wrinkle and the sulcus mentolabialis to deepen. This muscle is often used in expressions of doubt or disdain.

Clinical Significance

Damage to the transverse muscle of the chin can result in a loss of control over the lower lip, leading to difficulties in speech and eating. It can also affect the individual's ability to express certain facial expressions.

See Also

• Facial muscles
• Facial nerve
• Mandible