ABSTRACT
A. The corrugator supercilii has both oblique and vertical heads. B. The procerus is the sole muscle responsible for creation of oblique glabellar lines. C. The corrugator supercilii would be completely denervated by division of the frontal branch. D. The frontalis is the main brow elevator and is encased within the galeal sheath. E. The orbicularis oculi is a significant contributor to glabellar rhytids.
