The patient/client is sitting (or standing) and either facing a mirror or facing the person who will demonstrate deep concentration or frowning. After showing a picture or demonstrating the frown, ask the patient/client to bring the eyebrows together during one of these actions. With the muscle relaxed initially and with permission, gently place one or two fingers between the eyebrows of the patient/client and ask the person to frown. Ask the person to relax and repeat these motions if necessary. If permission is not granted, then observe as the person frowns, relaxes and then frowns again.

On the video, you can observe the vertical ridges resulting from activation of the corrugator supercilii muscle. The corrugator supercilii muscle has transversely oriented fibers and courses between the medial ends of the eyebrows. This muscle draws the eyebrows mostly medially and somewhat downward and functions with the procerus, and often with the orbicularis oculi, in facial expressions occurring during frowning, deep concentration, or shielding the eyes from bright sunshine. If the eyebrows are pulled markedly inferiorly, then activation of the procerus muscle occurs. If the eyes are closing as in squinting, then activation of the orbicularis oculi muscle occurs. The palpations would occur between the eyebrows, on the superolateral part of the nose, and on the area surrounding the eye, respectively. The demonstrated motions are included in the video but not the palpations.