The Procerus (Pyramidalis nasi) is a small pyramidal slip arising by tendinous fibers from the fascia covering the lower part of the nasal bone and upper part of the lateral nasal cartilage; it is inserted into the skin over the lower part of the forehead between the two eyebrows, its fibers decussating with those of the Frontalis.

Origin/Proximal Attachment: From fascia over the lower of the nasal bone

Insertion/Distal Attachment: Into the skin of the lower part of the forehead between the eyebrows

Action/Relevance: Draws down the medial angle of the eyebrow giving expressions of frowning

Innervation: Buccal branch of the facial nerve

Notes: also known as the depressor glabellae or pyramidalis nasi