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.

Show Answer

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