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introductionstatpearls· Introduction· item NBK542280

The corrugator (or corrugator supercilii) muscles are a pair of muscles located at the medial end of the eyebrow. They have recognition as significant muscles in the glabellar and central forehead regions. The corrugator supercilii muscles (CSM) play a major role in elevating the medial segment of the eyebrow, depressing the lateral portion of the eyebrow and are responsible for producing vertical frown lines.[1]