GROSS ANATOMY

Detailed explanation-1: -During forearm flexion (bending the elbow), such as lifting a cup, a muscle called the biceps brachii is actually the prime mover; however, because it can be assisted by the brachialis, the brachialis is called a synergist in this action (Figure 10.2. 1).

Detailed explanation-2: -The biceps brachii and the brachioradialis are synergists in flexing the elbow, and the coracobrachialis flexes and adducts the shoulder.

Detailed explanation-3: -Muscle synergists We describe muscles that work together to create a movement as synergists. For example, iliacus, psoas major, and rectus femoris all can act to flex the hip joint.

Detailed explanation-4: -The biceps brachii has two synergist muscles that assist it in flexing the forearm. Both are found on the anterior side of the arm and forearm. One of these is the brachioradialis muscle which is largely on the forearm (see the next section) and the other is the brachialis, which is largely on the upper arm.

Detailed explanation-5: -The brachialis muscle is the primary flexor of the elbow. This muscle is located in the anterior compartment of the arm along with the biceps brachii and coracobrachialis.