Transverse muscle of the chin

Gray381.png

Transverse muscle of the chin

The transverse muscle of the chin is a small, paired muscle located in the human face. It is part of the group of muscles known as the muscles of facial expression. This muscle is situated in the chin region and plays a role in the movement and expression of the lower lip and chin.

Anatomy

The transverse muscle of the chin originates from the mandible, specifically from the area near the mental protuberance. It extends horizontally across the chin and inserts into the skin of the chin and lower lip. This muscle is closely associated with the mentalis muscle, which is another muscle of facial expression located in the chin area.

Function

The primary function of the transverse muscle of the chin is to assist in the movement of the lower lip and chin. It helps in the depression of the lower lip, contributing to expressions such as frowning or pouting. Additionally, it plays a role in the stabilization of the chin during various facial movements.

Innervation

The transverse muscle of the chin is innervated by the facial nerve, specifically by the mandibular branch of the facial nerve. The facial nerve is responsible for the innervation of all the muscles of facial expression.

Blood Supply

The blood supply to the transverse muscle of the chin is provided by branches of the facial artery, which is a branch of the external carotid artery. The facial artery supplies blood to the muscles and skin of the face.

Clinical Significance

Dysfunction or damage to the transverse muscle of the chin can result in difficulties with lower lip movement and facial expressions. This can occur due to facial nerve paralysis or trauma to the chin area. In some cases, surgical procedures involving the chin may also affect the function of this muscle.

See Also

• Muscles of facial expression
• Mentalis muscle
• Facial nerve
• Facial artery