Glenoid cavity articulates with the __________to form the shoulder joint.

Options

A. pelvic girdle
B. humerus
C. patella
D. sternum

Answer

To solve the question "Glenoid cavity articulates with the __________ to form the shoulder joint," we need to identify the correct anatomical structure that connects with the glenoid cavity.

### Step-by-Step Solution:

1. **Understanding the Glenoid Cavity**:
- The glenoid cavity is a shallow depression located on the scapula (shoulder blade). It plays a crucial role in the formation of the shoulder joint.

2. **Identifying the Articulating Bone**:
- The glenoid cavity is designed to articulate with the head of the humerus, which is the bone of the upper arm.

3. **Forming the Shoulder Joint**:
- When the head of the humerus fits into the glenoid cavity, it creates the shoulder joint, allowing for a wide range of motion in the arm.

4. **Evaluating the Options**:
- Option a: Pelvic girdle - Incorrect, as it is part of the lower body.
- Option b: Humerus - Correct, as it is the bone that fits into the glenoid cavity.
- Option c: Patella - Incorrect, as it is the kneecap and not related to the shoulder joint.
- Option d: Sternum - Incorrect, as it is part of the ribcage and does not articulate with the glenoid cavity.

5. **Conclusion**:
- Based on the anatomy of the shoulder joint, the correct answer is **option b: humerus**.

### Final Answer:
The glenoid cavity articulates with the **humerus** to form the shoulder joint.