It is inserted into the skin over the lower part of the forehead between the two eyebrows on either side of the midline, its fibers merging with those of the frontalis muscle.

[1] The procerus muscle is supplied by the temporal branch of the facial nerve (VII).

The procerus muscle helps to pull that part of the skin between the eyebrows downwards, which assists in flaring the nostrils.

[4] The procerus muscle may be denervated to reduce furrow lines around the glabella caused by frowning.

[2] This article incorporates text in the public domain from page 382 of the 20th edition of Gray's Anatomy (1918)