How many neurology questions are on the NAVLE?

Neurology questions appear across multiple species categories on the NAVLE, typically accounting for roughly 15–25 questions in total across the exam. Because they span every species block, mastering neurolocalization pays dividends throughout the entire test.

What is the most important neurological concept to know for the NAVLE?

The single most tested concept is the UMN vs LMN distinction. Knowing whether a lesion is upper or lower motor neuron — based on reflex tone, muscle mass, and gait quality — immediately narrows the lesion location and the differential diagnosis list.

What is the neurolocalization algorithm for the NAVLE?

Work from the head caudally: Forebrain (seizures, altered mentation, contralateral deficits) ? Brainstem (cranial nerve deficits plus long-tract signs, altered consciousness) ? Cerebellum (dysmetria, intention tremor, NO weakness) ? C1–C5 (UMN all 4 limbs) ? C6–T2 (LMN thoracic limbs, UMN pelvic limbs, Horner's) ? T3–L3 (UMN pelvic limbs only, normal thoracic limbs) ? L4–S3 (LMN pelvic limbs, perineal reflex loss).

How do you distinguish peripheral from central vestibular disease on the NAVLE?

Both cause head tilt, nystagmus, and ataxia falling toward the side of the lesion. Peripheral (CN VIII or middle/inner ear) typically shows horizontal nystagmus that does not change with head position and no proprioceptive deficits. Central (brainstem) may show vertical or positional nystagmus, cranial nerve deficits beyond CN VIII, and postural reaction deficits. Old dog vestibular syndrome is peripheral and idiopathic with an excellent prognosis.

What is the first-line treatment for status epilepticus in dogs and cats?

Diazepam (IV, IO, or rectal) is first-line for acute seizure termination. If seizures continue, phenobarbital IV is the next step. Levetiracetam is increasingly used as an adjunct or alternative, especially when phenobarbital is contraindicated. Any continuous seizure lasting more than 5 minutes or repeated seizures without return to baseline consciousness constitutes status epilepticus requiring emergency treatment.

What causes EPM in horses and how is it diagnosed?

Equine protozoal myeloencephalitis (EPM) is caused by Sarcocystis neurona, acquired by ingesting opossum-contaminated feed or water. Diagnosis combines clinical signs (asymmetric ataxia and weakness, often with cranial nerve involvement) with CSF or serum SAG antibody testing. Treatment is with ponazuril or diclazuril. A negative serum titer makes EPM less likely but does not rule it out.

What differentiates tetanus from botulism on the NAVLE?

Both are caused by Clostridium toxins but produce opposite motor signs. Tetanus toxin (tetanospasmin) blocks inhibitory glycine interneurons, causing spastic paralysis — risus sardonicus, trismus, and flehmen posture in horses. Botulism toxin blocks acetylcholine release at the neuromuscular junction, causing flaccid LMN paralysis with progressive weakness. Botulism is rapidly fatal without antitoxin; tetanus is treated with penicillin, antitoxin, and muscle relaxants.

NAVLE exam-prep

NAVLE Neurology High-Yield Guide: Nervous System Questions Decoded

April 6, 2026 5 min read 213 views

Master NAVLE neurology with this high-yield guide covering UMN vs LMN distinctions, neurolocalization, top diseases by species, and seizure management to pass with confidence.

Neurology questions appear in every species block on the NAVLE, adding up to roughly 15–25 questions across the exam. That breadth makes veterinary neurology one of the highest-leverage areas to study. The good news: the exam emphasizes neurolocalization — deciding where the lesion is — far more than memorizing obscure treatment protocols. Master the UMN vs LMN distinction, work through the neurological exam systematically, and apply the localization algorithm, and the majority of NAVLE nervous system questions become straightforward pattern recognition.

This guide covers every high-yield neurology concept for the NAVLE: the neurological exam, UMN/LMN differentiation, neurolocalization by spinal cord segment, top diseases by species, toxin-related neurological signs, and seizure emergency management. Bookmark it alongside the NAVLE Exam Complete Guide for your full study plan.

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