10. Which of the following is a muscle of the shoulder girdle? a. The biceps brachii b. The triceps brachii c. The intercostals d. The coracobrachialis

To determine which of the options is a muscle of the shoulder girdle, let's analyze each option: a. **The biceps brachii** - This muscle is primarily located in the upper arm and is responsible for flexing the elbow and supinating the forearm. It does have a small role in shoulder flexion, but it is not primarily considered a muscle of the shoulder girdle. b. **The triceps brachii** - This muscle is located at the back of the upper arm and is primarily responsible for extending the elbow. It does not play a significant role in the shoulder girdle. c. **The intercostals** - These muscles are located between the ribs and are primarily involved in the mechanics of breathing. They are not associated with the shoulder girdle. d. **The coracobrachialis** - This muscle is located in the upper arm and originates from the coracoid process of the scapula (part of the shoulder girdle). It assists in flexing and adducting the arm at the shoulder joint. Based on this analysis, the correct answer is: **d. The coracobrachialis**