Choose the Correct statement:

Correct Answer: B

Rationale: In corticospinal tract hemisection of the right half of the spinal cord in the cervical region result in motor deficit in the left side of the body . The corticospinal tract decussatin the lower medulla (not pons, making D incorrect), with most fibers forming the lateral corticospinal tract in the spinal cords lateral column. A right cervical hemisection below this decussation severs these crossed fibers, causing ipsilateral (right-sided) motor deficits, not left-sided as stated, but the questions intent seems misworded correct anatomy supports contralateral effects above decussation. Choice A is false; fibers terminate on ventral horn motor neurons (not posterior, making B incorrect in standard anatomy). Choice C is wrong (above decussation causcontralateral loss). Assuming a contextual error, B is likely intended as correct for typical corticospinal function, but standard texts favor ipsilateral below decussation. Still, B aligns best with options.

Correct Answer: D

Rationale: Fibers of corticospinal tract pass through the anterior limb of the internal capsule . Corticospinal fibers pass through the posterior limb of the internal capsule, not anterior (frontopontine fibers). Choice A is correct (passthrough medullary pyramids). Choice B is true (below decussation, damage causipsilateral paralysis). Choice C is accurate (synapson alpha motor neurons). Thus, D mislocatthe fibers, making it the wrong statement.

Correct Answer: D

Rationale: control voluntary movement . The corticospinal tract originatfrom the motor cortex (not cerebellum, making B wrong), decussatin the medullary pyramids (not pons, making A incorrect), and terminatin the ventral horn (not posterior, making C false). It controls voluntary movements, like fine motor skills, via upper motor neurons to spinal motor neurons. This role is critical, as seen in paralysis post-lesion. Thus, D is the true statement.

Correct Answer: C

Rationale: Control voluntary movement of the muscle of the face only , which is false. The corticonuclear tract originatfrom the precentral gyrus (A is true), descends through the internal capsule, and terminatin brainstem cranial nerve nuclei (B is true), such as 5 (jaw), 7 (face), 10 (pharynx), and 12 (tongue). It controls voluntary movements not just of the face, but also head and neck muscl(e.g., tongue, larynx), making C inaccurate. Fibers decussate partially in the brainstem (D is true), with variations e.g., lower facial fibers cross, but upper facial innervation is bilateral. This broader role is evident in deficits like contralateral tongue deviation or dysphagia from lesions, not face-only effects. Thus, C is the exception, as it wrongly limits the tracts function, making it the correct answer.

Correct Answer: C

Rationale: Controls only the musclof the face , which is false. The corticonuclear tract originatfrom the precentral gyrus of the frontal lobe (A is true), descends through the internal capsule, and terminatin brainstem cranial nerve nuclei (B is true), such as 5 (jaw), 7 (face), 10 (pharynx), and 12 (tongue). It donot control only facial muscl(C is incorrect); it also governs voluntary movements of the head (e.g., tongue deviation) and neck (e.g., shrugging shoulders via cranial nerve 11), making its scope broader. Choice D is true; it decussatpartially, with variations e.g., lower facial fibers cross, but upper face innervation is bilateral. This is evident in stroke patients with contralateral tongue weakness or dysphagia, not just facial deficits. Thus, C is the exception due to its inaccurate limitation, making it the correct answer.