When you inject just the glabellar muscle when you do just the 11s, your patients may seem astonished, guilty, or frightened after the injections have been administered. That’s because the antagonist muscle, the muscle that opposes the muscles of the elevens, is the corrugator or frontalis muscle.
In the event that someone has a particularly strong frontalis muscle, which is responsible for lifting the patient’s eyebrows, and you relax the muscle responsible for lowering the patient’s brow, the patient will look like they’ve been scared.
Remember that when you perform the elevens on a person’s face, you may additionally need to perform two injection sites on the forehead to offset the relaxation of the corrugator muscles.
As a Botox injector, I can attest to the words of wisdom from Dr Howard Katz. It is imperative that you inject and thereby relax the agonist and antagonist muscles when treating cosmetic facial areas otherwise you will get an unpredictable result. It is recommended that the Frontalis & Corrugator Muscles along with the Glabella area and Orbicularis Oculi (Crowe’s Feet around the eyes) all be treated in the same session for the best outcome. Finally, always get treatment from an experienced injector and good luck to all.