Which of the following does not constitute appendicular skeleton ?

Options

A. Coxal bone
B. Scapula
C. Humerus
D. Sternum

Answer

To determine which of the following does not constitute the appendicular skeleton, we first need to understand the components of both the appendicular and axial skeletons.

1. **Define the Skeleton**: The human skeleton is divided into two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton includes the bones of the skull, vertebral column, and rib cage, while the appendicular skeleton consists of the bones of the limbs and the girdles that attach them to the axial skeleton.

2. **Identify the Bones in the Appendicular Skeleton**: The appendicular skeleton includes:
- Bones of the upper limbs (e.g., humerus, radius, ulna)
- Bones of the lower limbs (e.g., femur, tibia, fibula)
- Pelvic girdle (e.g., coxal bones)
- Pectoral girdle (e.g., scapula and clavicle)

3. **Analyze the Options**:
- **A. Coxal Bone**: This is part of the pelvic girdle and is included in the appendicular skeleton.
- **B. Scapula**: This is part of the pectoral girdle and is also included in the appendicular skeleton.
- **C. Humerus**: This is a bone of the upper limb and is part of the appendicular skeleton.
- **D. Sternum**: This is a flat bone located in the chest area and is part of the axial skeleton.

4. **Conclusion**: Since the sternum is the only option that is not part of the appendicular skeleton, the answer is D.

**Final Answer**: D. Sternum

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