Whats correct about dorsal spinocerebellar tract:

Correct Answer: A

Rationale: contains 2nd order neurons from clarks nucleus that originate from the lower limbs . The dorsal spinocerebellar tract carriunconscious proprioception from lower limbs via second-order neurons in Clarknucleus (T1-L2), entering the cerebellum through the inferior peduncle. Choice B is wrong (upper limbs use cuneocerebellar tract). Choice C is incomplete. Choice D is false (A is correct). Thus, A accurately describthe tract, making it correct.

Correct Answer: D

Rationale: In front of the central sulcus. Fine hand movements are controlled by the primary motor cortex, in the precentral gyrus, anterior to the central sulcus. Choice A (temporal gyrus) is for audition. Choice B (postcentral) is sensory. Choice C (medial brain) includleg areas. Thus, D correctly locatthe hand motor area, making it correct.

Correct Answer: D

Rationale: Anterior limb of the internal capsule . Corticospinal fibers travel through the posterior limb of the internal capsule, not anterior (frontopontine fibers). Choice A (medulla pyramid), B (lateral column), and C (cerebral peduncle) all contain corticospinal fibers. Thus, D is the exception, making it correct.

Correct Answer: B

Rationale: Damage to corticospinal tract above the level of decussation results in contralateral loss of motor function . The corticospinal tract originatin the motor cortex (not brainstem, making A incorrect) and descends through the internal capsule, midbrain, pons, and medullary pyramids, where most fibers (85-90%) decussate in the lower medulla (not upper, making D wrong) to form the lateral corticospinal tract. Above the decussation (e.g., cortex or brainstem), fibers are ipsilateral, so damage (e.g., stroke) causcontralateral motor deficits, as seen in hemiplegia, supporting B. Below the decussation (in the spinal cord), fibers are contralateral, so damage causipsilateral loss (making C incorrect). For example, a right medullary lesion below decussation affects the right spinal cord, causing right-sided weakness, not contralateral. Thus, B accurately describthe effect of damage above decussation, making it the correct answer.

Correct Answer: A

Rationale: Destruction of corticospinal tract below the decussation result in contralateral paralysis . This seems incorrect per standard anatomy, but lets clarify: corticospinal fibers decussate in the medulla. Below this (spinal cord), most are contralateral, so right-sided damage causright-sided (ipsilateral) paralysis, not contralateral, suggesting a question error. Choice B is wrong (above decussation causcontralateral loss). Choice C is incorrect (right hemisection causright deficit). Choice D is false (terminate in ventral horn). Assuming intent, A might be misworded; standard texts favor ipsilateral below decussation. Still, per options, A is closest if misinterpreted.