The facial muscles or muscles of facial expression are situated within the subcutaneous tissue and are responsible for the movements of skin folds, providing different facial expressions. The facial muscles originate from the bones of the facial skeleton viscerocranium and insert into the skin. The facial muscles are mostly grouped around the natural orifices of the face eyes, nose, mouth , taking part in the closing or widening of these orifices. The muscles in the calvaria region include the occipital and frontal bellies of the occipitofrontalis. Anatomy Next Support: support anatomynext.