The most inferior portion of the coxal bone is the:

Correct Answer: C

Rationale: The ischium, the lower posterior part of the coxal bone, is the most inferior, forming the sitz bones. The ilium is superior, pubis anterior, and acetabulum central, making 'Ischium' correct.

Correct Answer: D

Rationale: Freely movable joints are synovial (e.g., knee) and termed diarthrotic. Cartilaginous joints are slightly movable, so 'Both B and C are correct' reflects the synonymy of synovial and diarthrotic.

Correct Answer: C

Rationale: Flapping arms involves abduction (raising arms laterally) and adduction (lowering them), mimicking wings. Flexion/extension bends/straightens, supination/pronation rotates, and elevation/depression is shoulders, making 'abduction and adduction' correct.

Correct Answer: A

Rationale: The diaphysis is the shaft of a long bone, a cylindrical region of compact bone. This is standard anatomy, making 'True' correct.

Correct Answer: B

Rationale: A fontanelle is a soft, membranous gap between fetal cranial bones, not a cavity in bone (sinuses are cavities). This makes 'False' correct.