**Question:** Muscles attached to the greater tubercle of humerus

**Core Concept:** The greater tubercle of the humerus is a bony prominence on the upper arm bone (humerus) that serves as a point of attachment for several muscles.

**Why the Correct Answer is Right:**

The correct answer is **D:** Serratus Posterior Superior (SPS) muscle. The greater tubercle of the humerus is a site for the attachment of various muscles involved in shoulder girdle movement. Serratus Posterior Superior is one such muscle that plays a role in stabilizing the scapula and elevating the rib cage.

**Why Each Wrong Option is Incorrect:**

A. **Subscapularis:** This muscle is primarily involved in abducting and internally rotating the humerus. It does not attach to the greater tubercle of the humerus.

B. **Round ligament:** This is a thin, avascular structure connecting the liver and round ligament of the uterus, not related to the musculoskeletal system or the greater tubercle of the humerus.

C. **Supraspinatus:** This muscle is involved in elevating and externally rotating the humerus and does not attach to the greater tubercle of the humerus.

E. **None of the above:** This option is incorrect, as at least one muscle attaches to the greater tubercle of the humerus.

**Clinical Pearl / High-Yield Fact:** Understanding the musculature of the shoulder girdle is crucial for assessing and treating musculoskeletal disorders accurately. Knowledge of the muscles attached to the greater tubercle of the humerus is essential for clinicians to identify the cause of referred pain, diagnose conditions like rotator cuff injuries, and plan effective treatment strategies for patients experiencing shoulder pain or dysfunction.