NCS Neuroanatomy and Physiology 2

Question 1

Which brainstem structure contains the nucleus for cranial nerve VII and is responsible for facial motor control?

Accepted Answer

Pons

Answer

The facial nerve (CN VII) motor nucleus is located in the pons, which also houses nuclei for CN V, VI, and VIII.

Question 2

The dorsal column-medial lemniscal pathway decussates at which level of the central nervous system?

Accepted Answer

Caudal medulla (nucleus gracilis/cuneatus)

Answer

First-order neurons ascend ipsilaterally to synapse in the nucleus gracilis and cuneatus in the caudal medulla, where second-order axons then cross to form the medial lemniscus.

Question 3

Which cerebellar lobe is most associated with vestibulocerebellar functions, including balance and eye movement control?

Accepted Answer

Flocculonodular lobe

Answer

The flocculonodular lobe (archicerebellum) receives direct vestibular input and controls balance, gaze stabilization, and postural reflexes.

Question 4

A patient presents with ipsilateral Horner syndrome, ipsilateral facial sensory loss, and contralateral limb pain/temperature loss. Which structure is most likely affected?

Accepted Answer

Dorsolateral medulla

Answer

Lateral medullary (Wallenberg) syndrome results from occlusion of the posterior inferior cerebellar artery affecting the dorsolateral medulla, producing this classic crossed sensory pattern.

Question 5

The corticospinal tract synapses most directly onto alpha motor neurons via interneurons in which spinal cord lamina?

Accepted Answer

Lamina IX (ventral horn motor columns)

Answer

Corticospinal tract fibers primarily synapse directly or via interneurons onto alpha motor neurons in lamina IX of the anterior horn, though some also terminate in laminae IV–VIII.

(NCS) Neurologic Clinical Specialist Practice Test

(NCS) Neurologic Clinical Specialist Practice Test

NCS Neuroanatomy and Physiology 2