Neurologic Clinical Specialist (NCS)
NCS – NEUROLOGIC CLINICAL SPECIALIST | BOARD-CERTIFIED
NEUROLOGIC PHYSICAL THERAPY | EXAM QUESTIONS AND CORRECT
ANSWERS | VERIFIED NCS LATEST 2026/2027
Neurologic Clinical Specialist (NCS)
1. Which descending tract is primarily responsible for voluntary,
discrete, skilled movement of the distal limbs?
A. Reticulospinal tract
B. Lateral corticospinal tract
C. Vestibulospinal tract
D. Rubrospinal tract
ANSWER : B. The lateral corticospinal tract decussates in the
medullary pyramids and terminates on interneurons and motor
neurons controlling distal limb musculature for fine, skilled
movement.
2. Damage to the dorsal columns of the spinal cord would most directly
impair which sensory modality?
A. Visceral sensation
B. Proprioception and vibration sense
C. Crude touch and pressure
D. Pain and temperature
ANSWER : B. The dorsal (posterior) columns carry proprioceptive,
vibratory, and fine discriminative touch information ipsilaterally to
the medulla before decussating.
3. The spinothalamic tract decussates at which level relative to its cell
bodies of origin?
A. It does not decussate
B. Within one to two spinal segments of entry
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, Neurologic Clinical Specialist (NCS)
C. At the level of the pons
D. At the level of the medulla
ANSWER : B. Second-order neurons of the spinothalamic tract cross
via the anterior white commissure within one to two segments of
entering the cord, then ascend contralaterally.
4. Which cerebellar region is primarily responsible for coordinating
axial and proximal limb movement for balance and gait?
A. Dentate nucleus alone
B. Flocculonodular lobe
C. Lateral hemispheres (cerebrocerebellum)
D. Vermis (spinocerebellum)
ANSWER : D. The vermis and paravermal spinocerebellum receive
spinal proprioceptive input and regulate axial and proximal
musculature for postural control and gait.
5. The basal ganglia direct pathway, when facilitated, has what net
effect on thalamocortical activity?
A. Directly excites the spinal motor neurons
B. Inhibits the thalamus, suppressing movement
C. Has no effect on the thalamus
D. Disinhibits the thalamus, facilitating movement
ANSWER : D. Direct pathway activation inhibits the internal globus
pallidus/substantia nigra pars reticulata, releasing (disinhibiting)
the thalamus and facilitating intended movement.
6. Which artery most commonly supplies the internal capsule and is a
frequent site of lacunar infarcts?
A. Posterior inferior cerebellar artery
B. Anterior spinal artery
C. Lenticulostriate branches of the middle cerebral artery
D. Ophthalmic artery
ANSWER : C. The small penetrating lenticulostriate arteries off the
MCA supply the internal capsule and basal ganglia and are prone to
lipohyalinosis causing lacunar strokes.
7. A muscle spindle primarily detects which stimulus?
A. Tension generated by muscle contraction
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, Neurologic Clinical Specialist (NCS)
B. Joint capsule stretch
C. Change in muscle length and velocity of stretch
D. Cutaneous pressure
ANSWER : C. Muscle spindles are intrafusal fibers sensitive to length
change and velocity, providing feedback for the stretch reflex and
proprioception, distinct from Golgi tendon organs which sense
tension.
8. The Golgi tendon organ reflex (autogenic inhibition) is mediated by
which afferent fiber type?
A. Ia afferents
B. III afferents
C. Ib afferents
D. II afferents
ANSWER : C. Ib afferents from Golgi tendon organs synapse on
inhibitory interneurons that cause autogenic inhibition of the
homonymous muscle, protecting against excessive tension.
9. Which brainstem structure, when damaged, classically produces
locked-in syndrome?
A. Dorsal medulla
B. Lateral medulla
C. Ventral pons (basis pontis)
D. Midbrain tectum
ANSWER : C. Bilateral ventral pontine lesions, often from basilar
artery occlusion, interrupt corticospinal and corticobulbar tracts
while sparing the reticular activating system, producing
quadriplegia and anarthria with preserved consciousness and
vertical eye movement.
10. The reticulospinal tracts primarily influence which aspect of motor
function?
A. Postural tone and gross axial movement
B. Ocular smooth pursuit
C. Taste sensation
D. Fine finger dexterity
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, Neurologic Clinical Specialist (NCS)
ANSWER : A. Pontine and medullary reticulospinal tracts modulate
axial and proximal muscle tone and gross postural adjustments,
working with vestibulospinal tracts for balance.
Cranial Nerve Examination
11. A patient cannot abduct the right eye past midline and has
horizontal diplopia worse on right gaze. Which cranial nerve is most
likely involved?
A. Right CN VI (abducens)
B. Right CN IV (trochlear)
C. Left CN VI (abducens)
D. Right CN III (oculomotor)
ANSWER : A. CN VI innervates the lateral rectus for eye abduction; a
lesion produces failure of abduction and horizontal diplopia that
worsens looking toward the affected side.
12. Ptosis, a fixed dilated pupil, and the eye positioned 'down and out'
suggest a lesion of which cranial nerve?
A. CN VII (facial)
B. CN VI (abducens)
C. CN IV (trochlear)
D. CN III (oculomotor)
ANSWER : D. CN III supplies the levator palpebrae, pupillary
constrictor, and most extraocular muscles except lateral rectus and
superior oblique; its palsy produces ptosis, mydriasis, and down-
and-out eye position.
13. Loss of the corneal reflex on stimulation of the cornea, with intact
blink on the contralateral side stimulated, localizes to which afferent
nerve?
A. CN II (optic)
B. CN X (vagus)
C. CN VII (facial)
D. CN V (trigeminal, ophthalmic division)
ANSWER : D. The corneal reflex afferent limb is CN V1; the efferent
(blink) limb is CN VII, so absent sensation with an intact
contralateral response points to a trigeminal afferent deficit.
Page 4 of 64
NCS – NEUROLOGIC CLINICAL SPECIALIST | BOARD-CERTIFIED
NEUROLOGIC PHYSICAL THERAPY | EXAM QUESTIONS AND CORRECT
ANSWERS | VERIFIED NCS LATEST 2026/2027
Neurologic Clinical Specialist (NCS)
1. Which descending tract is primarily responsible for voluntary,
discrete, skilled movement of the distal limbs?
A. Reticulospinal tract
B. Lateral corticospinal tract
C. Vestibulospinal tract
D. Rubrospinal tract
ANSWER : B. The lateral corticospinal tract decussates in the
medullary pyramids and terminates on interneurons and motor
neurons controlling distal limb musculature for fine, skilled
movement.
2. Damage to the dorsal columns of the spinal cord would most directly
impair which sensory modality?
A. Visceral sensation
B. Proprioception and vibration sense
C. Crude touch and pressure
D. Pain and temperature
ANSWER : B. The dorsal (posterior) columns carry proprioceptive,
vibratory, and fine discriminative touch information ipsilaterally to
the medulla before decussating.
3. The spinothalamic tract decussates at which level relative to its cell
bodies of origin?
A. It does not decussate
B. Within one to two spinal segments of entry
Page 1 of 64
, Neurologic Clinical Specialist (NCS)
C. At the level of the pons
D. At the level of the medulla
ANSWER : B. Second-order neurons of the spinothalamic tract cross
via the anterior white commissure within one to two segments of
entering the cord, then ascend contralaterally.
4. Which cerebellar region is primarily responsible for coordinating
axial and proximal limb movement for balance and gait?
A. Dentate nucleus alone
B. Flocculonodular lobe
C. Lateral hemispheres (cerebrocerebellum)
D. Vermis (spinocerebellum)
ANSWER : D. The vermis and paravermal spinocerebellum receive
spinal proprioceptive input and regulate axial and proximal
musculature for postural control and gait.
5. The basal ganglia direct pathway, when facilitated, has what net
effect on thalamocortical activity?
A. Directly excites the spinal motor neurons
B. Inhibits the thalamus, suppressing movement
C. Has no effect on the thalamus
D. Disinhibits the thalamus, facilitating movement
ANSWER : D. Direct pathway activation inhibits the internal globus
pallidus/substantia nigra pars reticulata, releasing (disinhibiting)
the thalamus and facilitating intended movement.
6. Which artery most commonly supplies the internal capsule and is a
frequent site of lacunar infarcts?
A. Posterior inferior cerebellar artery
B. Anterior spinal artery
C. Lenticulostriate branches of the middle cerebral artery
D. Ophthalmic artery
ANSWER : C. The small penetrating lenticulostriate arteries off the
MCA supply the internal capsule and basal ganglia and are prone to
lipohyalinosis causing lacunar strokes.
7. A muscle spindle primarily detects which stimulus?
A. Tension generated by muscle contraction
Page 2 of 64
, Neurologic Clinical Specialist (NCS)
B. Joint capsule stretch
C. Change in muscle length and velocity of stretch
D. Cutaneous pressure
ANSWER : C. Muscle spindles are intrafusal fibers sensitive to length
change and velocity, providing feedback for the stretch reflex and
proprioception, distinct from Golgi tendon organs which sense
tension.
8. The Golgi tendon organ reflex (autogenic inhibition) is mediated by
which afferent fiber type?
A. Ia afferents
B. III afferents
C. Ib afferents
D. II afferents
ANSWER : C. Ib afferents from Golgi tendon organs synapse on
inhibitory interneurons that cause autogenic inhibition of the
homonymous muscle, protecting against excessive tension.
9. Which brainstem structure, when damaged, classically produces
locked-in syndrome?
A. Dorsal medulla
B. Lateral medulla
C. Ventral pons (basis pontis)
D. Midbrain tectum
ANSWER : C. Bilateral ventral pontine lesions, often from basilar
artery occlusion, interrupt corticospinal and corticobulbar tracts
while sparing the reticular activating system, producing
quadriplegia and anarthria with preserved consciousness and
vertical eye movement.
10. The reticulospinal tracts primarily influence which aspect of motor
function?
A. Postural tone and gross axial movement
B. Ocular smooth pursuit
C. Taste sensation
D. Fine finger dexterity
Page 3 of 64
, Neurologic Clinical Specialist (NCS)
ANSWER : A. Pontine and medullary reticulospinal tracts modulate
axial and proximal muscle tone and gross postural adjustments,
working with vestibulospinal tracts for balance.
Cranial Nerve Examination
11. A patient cannot abduct the right eye past midline and has
horizontal diplopia worse on right gaze. Which cranial nerve is most
likely involved?
A. Right CN VI (abducens)
B. Right CN IV (trochlear)
C. Left CN VI (abducens)
D. Right CN III (oculomotor)
ANSWER : A. CN VI innervates the lateral rectus for eye abduction; a
lesion produces failure of abduction and horizontal diplopia that
worsens looking toward the affected side.
12. Ptosis, a fixed dilated pupil, and the eye positioned 'down and out'
suggest a lesion of which cranial nerve?
A. CN VII (facial)
B. CN VI (abducens)
C. CN IV (trochlear)
D. CN III (oculomotor)
ANSWER : D. CN III supplies the levator palpebrae, pupillary
constrictor, and most extraocular muscles except lateral rectus and
superior oblique; its palsy produces ptosis, mydriasis, and down-
and-out eye position.
13. Loss of the corneal reflex on stimulation of the cornea, with intact
blink on the contralateral side stimulated, localizes to which afferent
nerve?
A. CN II (optic)
B. CN X (vagus)
C. CN VII (facial)
D. CN V (trigeminal, ophthalmic division)
ANSWER : D. The corneal reflex afferent limb is CN V1; the efferent
(blink) limb is CN VII, so absent sensation with an intact
contralateral response points to a trigeminal afferent deficit.
Page 4 of 64
