Question

Coxal bone is formed by fusion of ____________ bones

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

Answer:

B. 3

The coxal bone, also known as the hip bone or innominate bone, is formed by the fusion of three separate bones: the ilium, ischium, and pubis.

These three bones are distinct in a young child, joined by cartilage. As a person matures, they fuse together at the acetabulum, a cup-shaped socket that articulates with the head of the femur to form the hip joint.

• Ilium: The largest and most superior part of the coxal bone, forming the broad, fan-shaped portion you can feel on your hips.

• Ischium: The posteroinferior part of the coxal bone, often referred to as the "sit bone" because it bears the weight of the body when seated.

• Pubis: The anteromedial portion of the coxal bone, which joins with the pubis of the opposite side at the pubic symphysis.