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The procerus muscle is a pyramidal-shaped muscle of facial expression part of the glabellar complex. The procerus muscle is derived from the second pharyngeal arch, innervated by branches of the facial nerve, and supplied by the facial artery via the external carotid artery. The structure and functionality of the procerus muscle and the associated glabellar complex are of clinical importance in cosmetic and surgical procedures, including botulinum toxin injection, injectable fillers, and blepharoplasty.