The main function of the frontalis muscle is to raise the eyebrows and wrinkle the forehead, Think about the last time you were really surprised or scared. When you were surprised or scared, how did your facial expression look? When most people are shocked or frightened, their eyebrows are raised and their forehead becomes wrinkled. Therefore, the frontalis muscle is used to generate these types of facial expressions.
AREAS SCM TRIGGER POINTS REFER PAIN TO :
Headaches or Migraines
The X's represent the Trigger Points apply pressure gently until your on the edge of "good" pain. The red shaded area is the referred pain caused by the Trigger Point and the darker red means more people experienced pain in that area.
Simons, David G., Lois S. Simons, and Janet G. Travell. Travell & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Baltimore, MD: Williams & Wilkins, 1999.
The Trigger Point& Referred Pain Guide.