The Procerus is a small pyramidal slip of muscle deep to the superior orbital nerve, artery and vein.
Origin and insertion
It arises 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.
It helps to pull that part of the skin between the eyebrows downwards, which assists in flaring the nostrils
It can also contribute to an expression of anger.
It is supplied by the buccal branch of CN VII and can produce transverse wrinkles.