Which word stands for the serrated lines connecting cranial bones?

Correct Answer: B

Rationale: Sutures are the serrated, immovable joints connecting cranial bones, such as the coronal or sagittal sutures. 'Sews' and 'stitches' relate to sewing, not anatomy, making 'sutures' the precise term.

Correct Answer: B

Rationale: The spinous process is the rear-most projection of a vertebra, extending from the vertebral arch for muscle and ligament attachment. 'Spine' is too general, and 'spinal' is an adjective, not the structure’s name.

Correct Answer: B

Rationale: The humerus is the single bone of the upper arm, extending from the shoulder to the elbow. The forearm contains the radius and ulna, not the humerus.

Correct Answer: B

Rationale: Each hip bone (os coxa) in an adult is formed by the fusion of three bones: ilium, ischium, and pubis, which unite at the acetabulum during development.

Correct Answer: B

Rationale: The hallux (big toe) has 2 phalanges (proximal and distal), like the thumb, unlike the other toes, which have 3 (proximal, middle, distal), due to its structural role.