Corrugator supercilii muscle

It draws the eyebrow downward and medially, producing the vertical "frowning" wrinkles of the forehead. It may be thought as the principal muscle in the facial expression of suffering. It also shields the eyes from strong sunlight.

Structure

The corrugator supercilii muscle is located at the medial end of the eyebrow. Its fibers pass laterally and somewhat superiorly from its origin to its insertion.

Origin

It arises from bone at the medial extremity of the superciliary arch.

Insertion

It inserts between the palpebral and orbital portions of the orbicularis oculi muscle. It inserts into the deep surface of the skin of the eyebrow, above the middle of the orbital arch.

Innervation

Motor innervation is provided by the temporal branches of facial nerve (CN VII).

Vasculature

The muscle receives arterial supply from adjacent arteries - mostly from the superficial temporal artery, and the ophthalmic artery.

Relations

It is situated deep to the frontalis muscle (of the occipitofrontalis muscle) and orbicularis oculi muscle, with which it partially blends. Its fibres are situated between the palpebral and orbital portions of the orbicularis oculi muscle.

The supratrochlear nerve passes between this muscle and the frontalis muscle.