Which of the following components is a part of the pectoral girdle?
(a) Acetabulum
(b) Glenoid cavity
(c) llium
(d) Sternum

Options

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

Explanation

To determine which component is a part of the pectoral girdle, let's analyze each option provided in the question.

1. **Understanding the Pectoral Girdle**: The pectoral girdle, also known as the shoulder girdle, is made up of two main bones on each side: the clavicle (collarbone) and the scapula (shoulder blade).

2. **Analyzing the Options**:
- **(a) Acetabulum**: This is a socket in the pelvis that receives the head of the femur, thus it is part of the pelvic girdle, not the pectoral girdle.
- **(b) Glenoid cavity**: This is a part of the scapula and serves as the socket for the head of the humerus in the shoulder joint. Therefore, it is indeed a part of the pectoral girdle.
- **(c) Ilium**: This is the uppermost and largest bone of the pelvis, which is part of the pelvic girdle, not the pectoral girdle.
- **(d) Sternum**: This is the breastbone located in the center of the chest. It is not part of the pectoral girdle.

3. **Conclusion**: Based on the analysis, the correct answer is **(b) Glenoid cavity**, as it is a component of the pectoral girdle.