Which bone articulates distally with the talus in the foot?

Correct Answer: C

Rationale: The talus, in the ankle, articulates distally with the calcaneus (heel bone) below it, forming the subtalar joint. The navicular and cuneiforms are more distal, and the first metatarsal is further forward.

Correct Answer: A

Rationale: Haversian canals are channels in compact bone containing blood vessels and nerves, characteristic of long bones like the humerus. Scapula (flat), pubis (irregular), and clavicle (long but less typical) have compact bone, but the humerus is a classic example of Haversian system structure.

Correct Answer: B

Rationale: The human spine (vertebral column) consists of 33 bones: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused into the sacrum), and 4 coccygeal (fused into the coccyx). In adults, the sacral and coccygeal bones fuse, but the total count remains 33 individual vertebrae.

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 foramen magnum, located in the occipital bone, is the large opening at the skull’s base through which the spinal cord passes to connect with the brainstem. 'Maximum' is not an anatomical term here.