Procerus

The procerus (Latin: musculus procerus, musculus pyramidalis nasi) is a triangular-shaped muscle of facial expression located in the glabellar area between the dorsum of the nose and the forehead. It is classified as the nasal facial muscle.

Origin

The procerus muscle originates from the midline of the nasal bone and the upper part of the lateral nasal cartilage.

Insertion

The procerus inserts into the skin of the lower part of the forehead between the eyebrows. It also blends with the fibers of the frontal belly of the occipitofrontalis muscle.

Action

The procerus muscle depresses the medial eyebrow angle. Contractions of this muscle are also responsible for producing a transverse fold across the glabella.

Innervation

The nerve supply to the procerus muscle is provided by the buccal branch of the facial nerve (CN VII).

Blood supply

The procerus is supplied mainly by the angular and lateral nasal branches of the facial artery.