Which of the following bone belongs to the appendicular skeleton?
cranium
vertebrae
clavicle
ribs
The correct answer and explanation is :
Correct Answer: Clavicle
The human skeleton is divided into two main parts: the axial skeleton and the appendicular skeleton. Understanding their differences is essential in identifying which bones belong to which category.
Axial Skeleton
The axial skeleton consists of bones that form the central core of the body, primarily supporting and protecting vital organs such as the brain, spinal cord, and heart. It includes:
- Cranium (skull): Protects the brain.
- Vertebrae (spinal column): Supports the body and protects the spinal cord.
- Ribs: Protects the heart and lungs.
Appendicular Skeleton
The appendicular skeleton consists of bones associated with movement and limb attachment. It includes the pectoral girdle (shoulder bones), pelvic girdle (hip bones), and limbs (arms and legs). The clavicle, also known as the collarbone, is part of the pectoral girdle and connects the upper limb to the axial skeleton.
Why is the Clavicle Part of the Appendicular Skeleton?
The clavicle plays a crucial role in shoulder movement and upper limb function. It serves as a connection between the sternum (part of the axial skeleton) and the scapula (shoulder blade), providing stability and flexibility to the arm. Since the appendicular skeleton is mainly responsible for movement, and the clavicle aids in shoulder mobility, it is correctly classified as an appendicular bone.
Conclusion
Among the given options, the clavicle is the only bone belonging to the appendicular skeleton. The cranium, vertebrae, and ribs all belong to the axial skeleton, which supports and protects the body’s core structures.