which of the following is a part of the pectoral girdle ?

Options

A. Glenoid cavity
B. Sternum
C. Sternum llium
D. Acetabulum

Answer

To determine which of the following is a part of the pectoral girdle, we will analyze each option provided in the question:

1. **Understanding the Pectoral Girdle**:
- The pectoral girdle, also known as the shoulder girdle, connects the upper limbs to the axial skeleton. It consists of two main bones: the scapula (shoulder blade) and the clavicle (collarbone).

2. **Analyzing the Options**:
- **Option A: Glenoid cavity**:
- The glenoid cavity is a shallow, cup-shaped structure located on the lateral angle of the scapula. It serves as the socket for the shoulder joint, articulating with the head of the humerus. Thus, it is indeed a part of the pectoral girdle.
- **Option B: Sternum**:
- The sternum, or breastbone, is part of the axial skeleton and does not form part of the pectoral girdle.
- **Option C: Sternum ileum**:
- This option seems to be a combination of two different structures. The ileum is part of the pelvic girdle, while the sternum is part of the axial skeleton. Neither forms part of the pectoral girdle.
- **Option D: Acetabulum**:
- The acetabulum is a socket in the pelvis that articulates with the head of the femur. It is part of the pelvic girdle, not the pectoral girdle.

3. **Conclusion**:
- Based on the analysis, the only structure that is a part of the pectoral girdle is the **glenoid cavity**.

Thus, the answer to the question is **Option A: Glenoid cavity**.