ANATOMY

Detailed explanation-1: -The corrugator supercilii muscle is a small, narrow, pyramidal muscle close to the eye. It arises from the medial end of the superciliary arch, and inserts into the deep surface of the skin of the eyebrow. It draws the eyebrow downward and medially, producing the vertical wrinkles of the forehead.

Detailed explanation-2: -The corrugator supercilii muscles are two small, triangular facial muscles, which contribute to movement of the eyebrows, including frowning. They are located deep to the frontal part of occipitofrontalis and orbicularis oculi muscles, with which they blend 2.

Detailed explanation-3: -The corrugator muscle is a brow depressor, pulling the brow medially and inferiorly, producing vertical glabellar folds. Innervation is from terminal branches of the frontal branch of the facial nerve.

Detailed explanation-4: -Most of the corrugator muscle is located under the eyebrow, except for the most medial and superior portion, where the corrugator fibers are superior to the eyebrow. The medial third of the muscle, however, does not appear to traverse through the orbicularis oculi to the dermis.

Detailed explanation-5: -The corrugator supercilii muscle is a strong muscle that extends from bone near the top of the nose to the underside of the skin just above the mid portion of the eyebrow (glabella). Contraction of the corrugator causes vertical wrinkles between the eyebrows, often called “frown lines."