Which of the following is a NOT a projection from a bone surface?

Correct Answer: C

Rationale: A trabeculum (trabeculae) is an internal structure in spongy bone, not a surface projection. Trochanter, tubercle, and tuberosity are projections. Answer is C, per the document.

Correct Answer: C

Rationale: Pelvic girdle: coxal bones; pectoral girdle: clavicles, scapulae. Manubrium, cervical, coccyx, sacrum are axial. Answer is C, per the document.

Correct Answer: C

Rationale: Articulation is the joint or contact between two bones (e.g., knee). Other options describe different connections. Answer is C, per the document.

Correct Answer: C

Rationale: The Haversian canal (central canal) in an osteon holds blood vessels, named after Clopton Havers. Not a foramen, groove, or medullary canal. Answer is C, per the document.

Correct Answer: D

Rationale: Osteoblasts form bone by secreting matrix, maturing into osteocytes. Osteons are structures, osteoclasts resorb bone. Answer is D, per the document.