How many practice questions should I do for the neurology shelf?

For a standard 4-week neurology clerkship, aim for 400 to 500 dedicated practice questions alongside 3 to 4 official NBME Clinical Science Subject Examination forms. Neurology is famously rule-based: every clinical vignette contains an exact neuroanatomic roadmap designed to test whether you can localize the lesion before selecting imaging or pharmacotherapy. Doing 15 to 20 timed questions daily while sketching out the involved pathways and vascular distributions is the single most effective way to earn honors.

How do I approach neuroanatomic lesion localization questions?

Follow a strict 3-step hierarchy on every vignette: 1) What is the neuraxis level? (Cortex, subcortical internal capsule, brainstem, spinal cord, anterior horn cell, peripheral nerve, neuromuscular junction, or muscle); 2) Is it upper motor neuron (UMN: spasticity, hyperreflexia, upward Babinski) or lower motor neuron (LMN: flaccid tone, hyporeflexia, fasciculations, muscle atrophy)?; 3) What is the vascular territory or pathological process? For brainstem lesions, use the "Rule of 4s": medial brainstem structures (motor pathway, medial lemniscus, MLF, motor cranial nerves 3, 4, 6, 12) versus lateral brainstem structures (spinothalamic tract, sympathetic tract, sensory cranial nerve nuclei 5, 8, 9, 10, cerebellar peduncles).

What are the essential acute ischemic stroke inclusion and exclusion criteria?

Intravenous thrombolysis (alteplase or tenecteplase) is indicated for disabling ischemic stroke presenting within 4.5 hours of symptom onset (or last known normal). Absolute contraindications include: active internal hemorrhage, recent intracranial hemorrhage, acute head trauma or stroke within 3 months, intracranial neoplasm or aneurysm, platelet count 1.7 or therapeutic direct oral anticoagulant use within 48 hours, and blood pressure > 185/110 mm Hg refractory to acute antihypertensives (IV labetalol, nicardipine, or clevidipine). Mechanical endovascular thrombectomy is indicated up to 24 hours for large vessel occlusions (e.g., internal carotid or proximal MCA) guided by perfusion imaging (DEFUSE-3 / DAWN trials).

What is the passing score and honors cutoff for the neurology shelf?

While the NBME provides standardized equated percent correct scores and national percentile tables, passing and honors thresholds are determined independently by each medical school’s clerkship grading committee. Typically, the national passing standard sits near the 5th to 10th percentile (scaled score around 60–64), whereas achieving an Honors grade generally demands scoring at or above the 70th to 85th percentile (often a scaled score between 78 and 84). Check your school’s clerkship handbook at the beginning of the rotation to confirm your institution’s numerical cutoff.

How do I differentiate myasthenia gravis from Lambert-Eaton on shelf questions?

Focus on fatigability versus facilitation and autonomic symptoms: Myasthenia gravis is caused by antibodies against postsynaptic acetylcholine receptors (AChR); it presents with fluctuating, fatigable ptosis, diplopia, bulbar weakness, and proximal limb weakness that worsens with repetitive activity and improves with rest/cold; deep tendon reflexes are normal. Lambert-Eaton myasthenic syndrome (LEMS) is caused by antibodies against presynaptic voltage-gated calcium channels (P/Q-type VGCC), strongly associated with small cell lung cancer; it presents with proximal leg weakness and hyporeflexia that temporarily improves following brief maximal isometric exercise (post-exercise facilitation), paired with prominent autonomic features (dry mouth, erectile dysfunction, constipation).

How is the Clinical Neurology shelf different from Step 2 CK neurology questions?

Step 2 CK emphasizes practical emergency management: deciding between non-contrast head CT versus MRI, initiating stroke pathways, and recognizing common headaches (migraine, tension, cluster). The NBME Clinical Neurology Subject Examination is substantially more neuroanatomically rigorous: you must localize exact brainstem cross-sectional stroke syndromes (Wallenberg lateral medullary vs. Dejerine medial medullary vs. Claude/Weber midbrain), identify specific visual field defect boundaries (pie in the sky vs. pie on the floor vs. junctional scotoma), and differentiate atypical Parkinsonian syndromes (Progressive Supranuclear Palsy vs. Multiple System Atrophy vs. Corticobasal Degeneration).

Neurology Shelf Practice Questions: Lesion Localization & Clerkship Strategy

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These neurology shelf practice questions focus on neuroanatomic localization, acute ischemic stroke pathways, and motor neuron disease differentiation. Free includes 10 questions per day with the diagnostic; Pro is $180/yr ($15/mo billed yearly or $25/mo monthly).

By Jed Whetten, MD Candidate, University of Arizona College of Medicine – Phoenix.

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Worked Clinical Vignettes

Work through authentic cases from the Penziv item bank. Each question illustrates a high-yield clinical dilemma tested on the NBME Clinical Neurology Subject Examination.

Case 1: Lateral Medullary (Wallenberg) Syndrome & PICA Infarction

A 58-year-old man comes to the emergency department due to sudden-onset severe vertigo, nausea, and vomiting that began 4 hours ago while eating breakfast. He also reports difficulty swallowing his food and hoarseness. His medical history includes hypertension, hyperlipidemia, and a 30-pack-year smoking history. Physical examination shows a blood pressure of 168/94 mm Hg and a regular pulse of 82/min. Neurologic examination reveals right-sided ptosis, miosis, and enophthalmos. Extraocular movements are intact, but there is prominent horizontal and rotatory nystagmus beating to the left. The patient has dysphonia and an impaired gag reflex on the right. Sensory examination shows decreased pinprick and temperature sensation over the right side of the face and over the left upper and lower extremities. Finger-to-nose testing reveals marked dysmetria on the right side. Strength is 5/5 in all four extremities. Occlusion of which of the following arteries is most likely responsible for this patient's presentation?

Posterior inferior cerebellar artery— Correct Answer

Anterior spinal artery

Anterior inferior cerebellar artery

Superior cerebellar artery

Basilar artery apex

Explanation:

Lateral medullary (Wallenberg) syndrome is most commonly caused by occlusion of the posterior inferior cerebellar artery (PICA) or the vertebral artery, presenting with ipsilateral facial pain/temperature sensory loss, contralateral body sensory loss, ipsilateral Horner syndrome, cerebellar ataxia, and nucleus ambiguus deficits (dysphagia, hoarseness, absent gag reflex).

Clinical recognition: The patient presents with lateral medullary syndrome, characterized by the combination of nucleus ambiguus involvement (dysphagia, hoarseness, loss of gag reflex), autonomic/sympathetic chain damage (ipsilateral Horner syndrome: ptosis, miosis, anhidrosis), vestibular nucleus involvement (vertigo, nystagmus, nausea), spinocerebellar pathway disruption (ipsilateral limb ataxia), and crossed sensory loss.
Crossed sensory loss mechanism: Disruption of the ipsilateral spinal trigeminal nucleus causes loss of pain and temperature on the ipsilateral face, whereas disruption of the crossing spinothalamic tract causes loss of pain and temperature on the contralateral body.
Vascular correlation: The lateral medulla is supplied by the posterior inferior cerebellar artery (PICA), a branch of the vertebral artery.

PICA infarcts spare motor strength because the corticospinal tracts run ventrally in the medullary pyramids.
The key distinguishing feature between lateral medullary syndrome (PICA) and lateral pontine syndrome (AICA) is dysphagia/hoarseness (nucleus ambiguus, PICA) versus facial paralysis and sensorineural hearing loss (facial nucleus and vestibulocochlear nerve, AICA).

Case 2: Miller Fisher Syndrome Triad & Anti-GQ1b Autoantibodies

A 44-year-old woman is evaluated in the clinic for an unsteady gait, diplopia, and progressive clumsiness of both hands over the past 5 days. Two weeks ago, she had a self-limited diarrheal illness that resolved without antimicrobial therapy. On physical examination, temperature is 37.0°C (98.6°F), blood pressure is 122/76 mm Hg, and pulse is 76/min. Neurologic examination shows bilateral symmetric limitation of ocular abduction, adduction, and elevation. Pupillary light reflexes are sluggish bilaterally. Sensation to light touch and pinprick is preserved throughout. Motor examination shows 5/5 strength in both upper and lower extremities. Deep tendon reflexes are completely absent (0/4) throughout all limbs. Finger-to-nose and heel-to-shin testing reveal marked bilateral dysmetria and dysdiadochokinesia. Her gait is broad-based and severely unsteady. Which of the following antibodies is most specifically associated with this patient's underlying condition?

Anti-GQ1b ganglioside antibodies— Correct Answer

Anti-acetylcholine receptor antibodies

Anti-glutamic acid decarboxylase antibodies

Anti-aquaporin-4 antibodies

Anti-P/Q-type voltage-gated calcium channel antibodies

Explanation:

Miller Fisher syndrome is a distinct variant of Guillain-Barré syndrome characterized by the classic clinical triad of acute ophthalmoplegia, ataxia, and areflexia, highly associated with anti-GQ1b antibodies.

Clinical recognition: The patient presents with the acute clinical triad of external ophthalmoplegia, ataxia, and generalized areflexia without significant limb weakness, following a diarrheal illness (e.g., Campylobacter jejuni).
Syndromic identification: This presentation defines Miller Fisher syndrome (MFS), a regional variant of acute inflammatory demyelinating polyneuropathy (Guillain-Barré syndrome).
Molecular pathophysiology: Molecular mimicry between microbial lipooligosaccharides and human neural gangliosides leads to autoantibody production. GQ1b gangliosides are heavily concentrated in the paranodal regions of human cranial nerves (CN III, IV, and VI) and muscle spindle primary afferents, explaining the ophthalmoplegia and ataxia.

More than 90% of patients with Miller Fisher syndrome have high titers of serum IgG anti-GQ1b antibodies.
Despite marked ataxia and extraocular weakness, limb motor strength is characteristically preserved.

Case 3: Amyotrophic Lateral Sclerosis: UMN and LMN Concomitant Signs

A 62-year-old man comes to the neurology clinic due to a 6-month history of progressive weakness in his hands and involuntary muscle twitching across his shoulders and arms. He has noticed frequent choking episodes when drinking liquids and reports that his speech has become increasingly slurred over the last 2 months. He has no numbness, tingling, bowel or bladder incontinence, or cognitive changes. Physical examination shows tongue fasciculations with marked atrophy of the lateral tongue borders. Palatal elevation is diminished bilaterally. Motor examination reveals severe wasting of the first dorsal interosseous and thenar muscles bilaterally, with visible fasciculations across the deltoids. Upper extremity strength is 3/5 in the distal muscle groups and 4/5 proximally; lower extremity strength is 4/5 proximally with increased tone and bilateral ankle clonus. Biceps and brachioradialis reflexes are 3+ bilaterally, and patellar reflexes are 4+ bilaterally with positive Babinski signs. Sensory testing is normal to all modalities. Which of the following is the most likely diagnosis?

Spinal muscular atrophy

Amyotrophic lateral sclerosis— Correct Answer

Multifocal motor neuropathy

Cervical spondylotic myelopathy

Myasthenia gravis

Explanation:

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder characterized by the simultaneous degeneration of both upper motor neurons (hyperreflexia, spasticity, Babinski sign) and lower motor neurons (muscle atrophy, fasciculations, flaccid weakness) in the absence of sensory or autonomic deficits.

Clinical recognition: The patient presents with progressive painless muscle weakness involving both bulbar (dysarthria, dysphagia, tongue atrophy/fasciculations) and limb musculature (hand weakness).
Dual motor neuron involvement: Examination shows lower motor neuron (LMN) signs (atrophy, fasciculations, weakness) combined with upper motor neuron (UMN) signs (brisk reflexes, clonus, spasticity, positive Babinski signs) in the same limbs.
Preserved functions: Sensory testing, extraocular movements, and sphincter function are completely spared, cementing the diagnosis of ALS.

Diagnosis of ALS requires evidence of combined LMN and UMN degeneration across multiple body segments (bulbar, cervical, thoracic, lumbosacral).
Disease-modifying agents include riluzole (glutamate release inhibitor) and edaravone (free radical scavenger).

Case 4: Progressive Supranuclear Palsy & Tau Pathology vs. Parkinsonism

A 67-year-old man is brought to the neurology clinic by his wife due to recurrent unexplained falls and personality changes over the past 9 months. His wife states that he falls backward without warning and has become increasingly irritable, rigid, and slow in his movements. On physical examination, blood pressure is 134/82 mm Hg without orthostatic changes. Mental status examination reveals apathy and psychomotor slowing. Cranial nerve examination shows marked limitation of voluntary downward and upward saccadic eye movements; however, full vertical excursion of the eyes is elicited when the examiner briskly flexes and extends the patient's neck. Muscle tone demonstrates prominent axial rigidity greater than appendicular rigidity. There is no resting tremor. When asked to rise from a chair, he stands with a wide base and tends to lurch backward, losing balance on pull testing. Which of the following neuropathologic findings is most characteristic of this patient's condition?

Intracellular neurofibrillary tangles composed of hyperphosphorylated tau protein— Correct Answer

Intracellular Lewy bodies composed of alpha-synuclein in the substantia nigra pars compacta

Extracellular amyloid-beta plaques and dystrophic neurites

Ubiquitin- and TDP-43-positive inclusions in frontotemporal cortical neurons

Intracytoplasmic alpha-synuclein inclusions within glial cells

Explanation:

Progressive supranuclear palsy (PSP) is a 4-repeat (4R) tauopathy characterized by early backward falls, vertical supranuclear gaze palsy (downward gaze affected first, overcome by oculocephalic maneuver), axial rigidity, and pseudobulbar affect.

Clinical recognition: The patient presents with Parkinson-plus features including early prominent postural instability with backward falls, symmetric axial rigidity greater than appendicular rigidity, apathy, and absence of resting tremor.
Supranuclear gaze palsy: The defining sign is impaired voluntary vertical saccades (vertical supranuclear gaze palsy, especially downward gaze) with preservation of vertical movements during passive head movements (doll's-eye / oculocephalic maneuver), indicating a supranuclear lesion.
Neuropathology: PSP is a primary tauopathy characterized by the accumulation of hyperphosphorylated, 4-repeat tau protein forming neurofibrillary tangles and tufted astrocytes in the subthalamic nucleus, substantia nigra, globus pallidus, and midbrain tectum (producing the 'hummingbird sign' of midbrain atrophy on MRI).

Early falls within the first year of symptoms strongly argue against idiopathic Parkinson disease and favor PSP.
The supranuclear nature of the gaze palsy is proven by intact reflex ocular excursions via the vestibulo-ocular reflex (doll's eyes).

Case 5: Idiopathic Intracranial Hypertension & Opening Pressure Protocol

A 28-year-old woman presents to the clinic with a 2-month history of daily, diffuse, pulsatile headaches that are worse in the morning and aggravated by bending forward. Over the last 2 weeks, she has experienced transient episodes of total darkness in both eyes lasting 2 to 5 seconds, typically provoked by standing up quickly. She also notes a rhythmic 'whooshing' sound in both ears that synchronizes with her pulse. Her medical history is significant for polycystic ovary syndrome and acne vulgaris treated with oral minocycline for the past 6 months. Her BMI is 34 kg/m². Blood pressure is 126/78 mm Hg, and pulse is 74/min. Visual acuity is 20/20 in both eyes. Funduscopic examination shows bilateral optic disc edema with blurred disc margins and flame hemorrhages. Cranial nerve examination reveals restricted abduction of the right eye with binocular horizontal diplopia on right lateral gaze. Non-contrast head CT and magnetic resonance venography are completely normal. Which of the following is the most appropriate next step in the diagnosis and management of this patient?

Endovascular balloon angioplasty

Temporal artery biopsy

Lumbar puncture with opening pressure measurement— Correct Answer

Initiation of high-dose intravenous methylprednisolone

Transcranial Doppler ultrasonography

Explanation:

Idiopathic intracranial hypertension (pseudotumor cerebri) presents with headache, transient visual obscurations, pulsatile tinnitus, papilledema, and abducens (CN VI) nerve palsy in young obese women; diagnosis requires neuroimaging to exclude mass/thrombosis followed by lumbar puncture demonstrating elevated opening pressure (≥250 mm H2O).

Clinical recognition: The patient is a young, obese woman presenting with classic symptoms of elevated intracranial pressure: positional headaches, transient visual obscurations, pulsatile tinnitus, papilledema, and a non-localizing right abducens nerve (CN VI) palsy.
Medication trigger: Tetracyclines (minocycline, doxycycline), isotretinoin, growth hormone, and excessive vitamin A are well-known pharmacologic triggers.
Diagnostic protocol: Neuroimaging (CT/MRI and MRV) must first exclude intracranial space-occupying lesions and cerebral venous sinus thrombosis. Once neuroimaging is confirmed normal, the next required diagnostic step is a lumbar puncture to document an elevated opening pressure (typically ≥250 mm H2O in adults) with normal CSF constituents, which fulfills the modified Dandy criteria.

Therapeutic lumbar puncture also provides immediate transient symptom relief.
First-line medical therapy is acetazolamide (carbonic anhydrase inhibitor) plus weight reduction and discontinuation of offending drugs (minocycline).

Core Decision Pillars for Neurology

High-yield decision rules for neuraxis localization, acute stroke triage, and motor neuron disease.

1. Systematic Neuraxis Localization (Rule of 4s)

Brainstem stroke syndromes follow the anatomic Rule of 4s: 4 medial structures starting with M (Motor corticospinal tract, Medial lemniscus, Medial longitudinal fasciculus, Motor cranial nerve nuclei 3, 4, 6, 12); and 4 lateral structures starting with S (Spinocerebellar pathway, Spinothalamic tract, Sensory nucleus of CN V, Sympathetic pathway). Medial infarcts produce contralateral motor weakness; lateral infarcts spare motor strength but cause Horner syndrome, ataxia, and crossed sensory loss.

2. Acute Ischemic Stroke Timelines & Thrombolysis

Intravenous thrombolysis (alteplase or tenecteplase) is indicated within 4.5 hours of symptom onset in disabling acute ischemic stroke without hemorrhage on non-contrast CT. Blood pressure must be lowered below 185/110 mm Hg before thrombolysis. Mechanical endovascular thrombectomy is indicated up to 24 hours for confirmed anterior circulation large vessel occlusions meeting clinical and perfusion mismatch criteria.

3. Differentiating Motor Neuron Disorders (UMN vs. LMN)

Amyotrophic lateral sclerosis (ALS) is definitively diagnosed by the coexistence of both upper motor neuron signs (spasticity, brisk reflexes, clonus, positive Babinski) and lower motor neuron signs (muscle wasting, fasciculations, flaccid weakness) across bulbar and limb segments, with complete preservation of sensory modalities and ocular motility.

Frequently Asked Questions

Common questions about shelf question volume, lesion localization rules, and acute stroke thrombolytic criteria.

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Diagnostic Quiz Runner

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