Appendicular skeleton — A/L Biology

How do I practise Appendicular skeleton?

1 question with a worked solution

1. In the human appendicular skeleton, which cup-shaped socket articulates with the head of the femur to form the hip joint, and what bones fuse to form it?
   1. A) Acetabulum formed by the fusion of the ilium, ischium, and pubis
   2. B) Obturator foramen formed by the ischium and pubis
   3. C) Olecranon fossa formed by the radius and ulna
   4. D) Glenoid cavity formed by the fusion of the clavicle and scapula
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   Correct answer: A) Acetabulum formed by the fusion of the ilium, ischium, and pubis

   The acetabulum is a deep hemispherical cup on the lateral surface of the coxal (hip) bone formed by the confluence of the ilium, ischium, and pubis. It receives the spherical head of the femur to form the multiaxial ball-and-socket hip joint.

   Show worked solution

   Step 1: Identify limb sockets: Shoulder socket = Glenoid cavity (scapula); Hip socket = Acetabulum (pelvic bone). Step 2: Acetabulum components = fusion of 3 bones: Ilium (superior), Ischium (postero-inferior), Pubis (antero-inferior). Answer: Acetabulum formed by the fusion of the ilium, ischium, and pubis.
   Modelled on: the A/L Biology examination pattern

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Where does Appendicular skeleton fit in the syllabus?

Year 2 · Term 1