The Probert Encyclopaedia of Medicine

PYRAMIDALIS NASI

The pyramidalis nasi, or procerus muscle, is a thin sheath of muscle placed over the nasal bone between the eyes. Its origin is with the fascia covering the lower part of the nasal bone (bridge of the nose) and it is inserted into the frontalis portion of the occipito-frontalis muscle and the skin over the lower part of the forehead between the two eyebrows. It is innervated by branches of the facial nerve (VII cranial nerve) and supplied by branches of the facial artery. The muscle draws the eyebrows down and together causing wrinkles across the bridge of the nose. It is used when expressing anger, pain, or frowning or concentrating.
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