How many different bones make up the skull - the ones protecting the brain and the ones giving structure to the face?

Correct Answer: C

Rationale: The human skull comprises 22 bones: 8 cranial bones (protecting the brain) and 14 facial bones (structuring the face). 2 is far too low (perhaps confusing cranial/facial sections), and 12 undercounts the total.

Correct Answer: B

Rationale: The nucleus pulposus, the inner core of an intervertebral disc, is gelatinous and elastic, allowing flexibility and shock absorption. The anulus fibrosus, the outer fibrous ring, is tougher and less elastic, providing strength.

Correct Answer: B

Rationale: The clavicle’s sternal end articulates with the manubrium (sternum), and its acromial end joins the scapula’s acromion, forming the shoulder’s structure. 'Sternal/acromial' matches this medial-to-lateral orientation.

Correct Answer: B

Rationale: Metacarpals are numbered 1 to 5 from thumb (lateral) to pinky (medial) in anatomical position, aligning with phalange numbering and standard convention.

Correct Answer: A

Rationale: The calcaneus (heel bone), alongside the talus, forms the ankle’s major structure, supporting weight and articulating with the tibia/fibula. Cuboid and navicular are more distal.