The paranasal sinuses drain into the and the mastoid sinuses drain into the

Correct Answer: B

Rationale: Paranasal sinuses (frontal, maxillary, etc.) drain into the nasal cavity via ducts. Mastoid sinuses (air cells in the temporal bone) connect to the middle ear, not inner ear, for drainage and pressure, making 'nose: middle ear' correct.

Correct Answer: B

Rationale: The hyoid bone, in the neck, is unique as it does not articulate with any bone, suspended by ligaments. The patella, phalanges, and occipital all articulate, making 'hyoid' correct.

Correct Answer: C

Rationale: Vertebrosternal (true) ribs (pairs 1-7) attach to thoracic vertebrae and directly to the sternum via their own costal cartilage. Vertebral are floating, and vertebrochondral share cartilage, making 'vertebrosternal' correct (incomplete options assumed).

Correct Answer: D

Rationale: The humerus head articulates with the glenoid cavity of the scapula, forming the shoulder joint. The femur is thigh, radius is forearm, and os coxa is hip, making 'scapula' correct.

Correct Answer: A

Rationale: The femur, the longest bone, forms the thigh, from hip to knee. The humerus is arm, tibia is shin, and ulna is forearm, making 'femur' correct.