The process of bone formation from a fibrous connective tissue membrane is called

Correct Answer: C

Rationale: Intramembranous ossification forms bone directly from fibrous connective tissue membranes, as in flat skull bones. Hematopoiesis makes blood cells, endochondral ossification uses cartilage, and remodeling reshapes bone, making 'intramembranous ossification' correct.

Correct Answer: C

Rationale: The sphenoid bone, butterfly-shaped, forms the cranium’s floor and sides, housing the pituitary. The ethmoid is anterior, occipital posterior, and temporal lateral, making 'sphenoid' correct.

Correct Answer: B

Rationale: The mandible (lower jaw) is the only skull bone that moves, via the temporomandibular joint, enabling chewing. The cranium, maxilla, and vomer are fixed, making 'mandible' correct.

Correct Answer: D

Rationale: The 12 pairs of ribs attach to the 12 thoracic vertebrae via costal facets, forming the thoracic cage. Cervical, lumbar, and sacral vertebrae lack rib articulations, making 'thoracic' correct.

Correct Answer: B

Rationale: The humerus is the single bone of the upper arm, from shoulder to elbow. Carpals are wrist, radius and ulna are forearm, making 'humerus' correct.