Corpus: Depressor supercilii muscle

The depressor supercilii muscle is a small, two-headed muscle located near the palpebral fissure, and it is part of the facial expression muscles (mimic musculature). Some authors debate whether this muscle is truly independent or part of the orbicularis oculi or corrugator supercilii muscles.

The depressor supercilii muscle originates from the frontal process of the maxilla and the superciliary arch of the frontal bone. Recent studies suggest that the muscle has two heads, with the angular artery and vein passing between them. The muscle fibers run steeply upward, inserting into the skin of the medial eyebrow.

The depressor supercilii muscle is innervated by the temporal branches of the facial nerve, the seventh cranial nerve (CN VII).

The depressor supercilii muscle is responsible for pulling the eyebrow downward. Due to its fusion with the skin, this movement causes the skin to follow, helping to create a horizontal fold in the glabellar region (frown lines) when working in conjunction with the procerus muscle.