The procerus (also procerus muscle, latin: musculus procerus, musculus pyramidalis nasi, musculus depressor glabellae) is an inconstant facial muscle located between the dorsum of the nose and the forehead.
The procerus originates from the midline of the nasal bone and from the nasal cartilage. It inserts into skin of the lower part of the forehead between the eyebrows, and into the frontal belly of the occipitofrontalis muscle.
The procerus depresses the medial eyebrow angle. Contractions of procerus are responsible for producing a transverse fold across the root of the nose.
The nerve supply to the procerus is provided by the buccal branch of the facial nerve (CN VII).