The human vertebrae are classified as which type of bone?

Correct Answer: B

Rationale: Vertebrae are classified as irregular bones due to their complex, unique shapes that don’t fit the long, short, or flat categories. Long bones (e.g., femur) are elongated, flat bones (e.g., sternum) are thin, and short bones (e.g., carpals) are cuboidal—vertebrae match none of these.

Correct Answer: B

Rationale: The cranium has a vault (the upper, domed portion) and a base (the lower portion), with the base divided into anterior, middle, and posterior cranial fossae supporting the brain. 'Vault/base' correctly orders these anatomical regions.

Correct Answer: C

Rationale: The zygomatic bone, a paired irregular bone, articulates with the maxilla and forms the cheekbone, contributing to the orbit’s structure. The palatine forms the palate, and the lacrimal is a small orbital bone, neither being the cheekbone.

Correct Answer: B

Rationale: The first seven pairs of ribs are 'true ribs,' attaching directly to the sternum via costal cartilage, forming the rib cage’s core. 'Actual' and 'real' are not anatomical terms in this context.

Correct Answer: A

Rationale: The interosseous membrane, a flexible ligament, connects the ulna and radius along their lengths, stabilizing them and allowing pronation/supination. 'Intraosseous' implies within a bone, not between.