Answer
The muscles of facial expression are located in the scalp and face , just under the skin. They insert onto the skin and other muscles--not bones-- therefore when they contract they move the skin of the face -- and other muscles of the face.
Work Step by Step
Examples:
The epicraneus inserts on the skin of the eyebrow, the root of the nose, and the epicranial aponeurosis.
Actions. When the epicraneus contracts, it raises the eyebrows as in surprise, and wrinkles the
forehead skin,horizontally.
The zygomaticus (muscle): This muscle inserts in the skin and muscle of the corners of the mouth.
Action: It raises the lateral corner of the mouth as in smiling; this is the "smiling muscle
