Image Based Question – 65235

The main actions of the muscles represented by a “red arrow” in the picture below are ?

A. Flexion of the forearm at the elbow.

B. Assists with flexion of the arm at the shoulder.

C. Assists with supination of the forearm.

D. All of the above.

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Correct Answer » D Explanation

Ans;D .All of the above

The muscle marked by a red arrow in the picture above represents biceps brachii.

Primary Actions of the Biceps Brachii

1. Flexion of the forearm at the elbow

• Agonists: Brachialis, Brachioradialis

• Antagonists: Triceps Brachii, Anconeus

Secondary Actions of the Biceps Brachii

1. Assists with flexion of the arm at the shoulder

• Agonists: Deltoid (anterior part), Coracobrachialis, Pectoralis Major (clavicular head)

• Antagonists: Deltoid (posterior part), Triceps Brachii (long head), Latissimus Dorsi, Pectoralis Major (sternal head), Teres Major

2. Assists with supination of the forearm

• Agonists: Supinator

• Antagonists: Pronator Teres, Pronator Quadratus