The occipitalis muscle pulls the scalp back, and to some extent can wiggle the ears. It creates a look of startle or surprise on the face. It can be involved in headaches by staying tense for too long.
The primary action is to anchor and retract the galea aponeurotica
occipitalis!
The position of the frontalis is over the frontal bone or the forehead. This muscle works with the occipitalis which is over the occipital bone in the back of the head. It's action is to elevate the eyebrows.
Occipitalis
nothing
shoulder flexion shoulder adduction shoulder horizontal extension
The Agonist muscle. In contrast, the muscle group that has passive action(the muscle being stretched) is called the antagonis muscle. For example, when doing a bicep curl. Your biceps are the agonists and your triceps would be the antagonists.
Is called the External Occipital Protuberance and its function is simply an attachment for the occipitalis muscle.
Trunk flexion & unilateral trunk flexion.
The primary mover.
trunk flexion lateral trunk flexion
Elevation of the humerus and slight medial roataion of the shoulder. The anterior deltiod is a semi-weak muscle.
While performing a hanging leg raise one of the intended actions of the primary muscle, the iliopsoas, is to flex the thigh and the trunk during the exercise. Other primary muscles include the rectus femoris, tensor fascia lata, and adductors.