The membranous regions in between the cranial bones of a fetal skull are called:

Correct Answer: A

Rationale: Fontanels are soft, membranous gaps between fetal cranial bones, allowing skull flexibility during birth and growth (e.g., anterior fontanel). Foramina are holes, sinuses are cavities, and sutures are adult joints, making 'fontanels' correct.

Correct Answer: C

Rationale: The vertebral column has 7 cervical, 12 thoracic, and 5 lumbar vertebrae in adults, totaling 24 movable vertebrae (plus sacrum and coccyx). '7: 12: 5' matches this standard count.

Correct Answer: D

Rationale: The sternum, or breastbone, is the flat bone in the chest’s center, connecting ribs. The clavicle is the collarbone, manubrium is a sternum part, and scapula is the shoulder blade, making 'sternum' correct.

Correct Answer: C

Rationale: The olecranon fossa, on the humerus’ posterior side, receives the ulna’s olecranon process when the elbow extends. The capitulum and trochlea articulate with the radius and ulna, and the head is proximal, making 'olecranon fossa' correct.

Correct Answer: C

Rationale: The leg includes the femur (thigh), tibia and fibula (lower leg), and patella (kneecap). Tarsals are ankle bones, not leg, making 'Femur, fibula, tibia and patella' correct.