Neuro Exam and Headache Review Notes (Cranial Nerves, Coordination, Sensory Testing, and Headache Classification)

Neuro Exam and Headache Review Notes

  • Importance of documentation and cranial nerve knowledge

    • Documentation is a replication of what you did, even with shortcuts
    • Essential to know cranial nerves and how to test them because abnormal findings are discussed clinically
    • When describing CN IX (Glossopharyngeal) and CN X (Vagus): assess voice quality, asymmetry, elevation of soft palate and uvula
    • On handouts, include what part of the brainstem or nervous system is tested; helps narrow down regions (e.g., cerebellum vs basal ganglia for coordination; posterior columns vs spinothalamic tract for sensation; corticospinal tract for motor tone/strength)
    • These connections help explain why we perform specific physical exam maneuvers (Bates references)
    • You do not need to recite all of this on a check-off list during the exam, but it aids understanding during nervous system testing and future rounds

  • Brain localization and test regions

    • Coordination involves cerebellar movement and some motor aspects linked to basal ganglia
    • Vibratory sensation relates to posterior columns
    • Pain and temperature relate to spinothalamic tract
    • Motor tone/strength relates to the corticospinal tract

  • Practical study approach and preparation tips

    • Focus on how each test maps to the underlying neuroanatomy
    • For memorization, consider quick self-quizzing on what each nerve tests and why
    • Use checklists to structure the exam, but also be able to discuss rationale when asked by preceptors
    • If uncertain, verbalize your thought process: you’re demonstrating knowledge even if you don’t perform every part of the exam perfectly
    • If you want alternative review formats, Bates resources and the Bates visual guide are recommended

Cranial Nerve Examination (Nerve-by-Nerve)

CN I — Olfactory

  • Test general olfaction with nostrils occluded; patient closes eyes
  • Always consider nasal obstruction (polyps, blockage) that could mimic CN I deficit
  • Test with two different smells on each side
  • Procedure details
    • Have patient occlude one nostril, eyes closed, test smell on each side
    • Use two distinct odors to avoid guessing (e.g., cinnamon, coffee)
  • Note: Some sources omit explicit testing details; be prepared to justify nose odor testing and consider nasal pathology if deficit is suspected

CN II — Optic

  • CN II is tested multiple times: visual acuity, visual fields, and fundoscopic exam
  • Visual acuity testing methods
    • Rosenbald’s method: test at a distance of 14'' from the chart
    • Snellen chart typically uses 36 ext{ inches}, so Rosenbald’s distance is slightly different
  • Visual field testing
    • Visual field by confrontation (perimetry): stand in front of patient and wiggle fingers to each quadrant; test peripheral fields, including nasal fields with one eye covered
  • Fundoscopy (optic fundi) exam
    • Inspect with ~15^ ext{degree} angle from the side, using the right eye for the patient’s right eye and the left eye for the patient’s left eye
    • Stabilize patient’s head, look for the red reflex, trace a vessel to the optic disc and fundus
    • Note: endoscopic fundus exam is more complex and rarely performed in routine practice
  • Additional considerations
    • Documentation should include red reflex and optic disc findings; ensure you separate optic testing from the neural section in your notes
    • The eye section of Bates materials typically covers these tests; some references place certain tests in other sections
  • Quick reminder: a unilateral deficit in visual acuity or field can localize a lesion somewhere along the optic pathway; correlate with fundoscopic findings and neuroimaging if indicated

CN III, IV, VI — Oculomotor, Trochlear, Abducens

  • Together assessed for pupil size, direct and consensual light reactions
  • Pupillary light reflex: direct response in the tested eye; consensual reflex in the opposite eye
  • Near reaction/accommodation
    • Accommodation is part of near reaction; the lens adjusts for near focus much like a camera lens with dioptric change
    • Test by having patient focus on a near object (e.g., pencil ~10 ext{ cm} away) then shift gaze to a distant object
    • Pupillary constriction occurs during near focus
  • Extraocular movements (EOMs)
    • Test in the pattern of large “H” movements (activate CN III, IV, VI) and convergence toward the nose
    • Ensure the patient follows the examiner’s finger with the eyes only (no head movement)

CN V — Trigeminal

  • Motor testing (CN V motor component)
    • Have patient clench teeth; palpate masseter and temporalis muscles to assess strength bilaterally
  • Sensory testing (CN V sensory component)
    • Test light touch using cotton or gauze on the three branches (ophthalmic V1, maxillary V2, mandibular V3)
    • Instruct patient to close eyes and say “now” every time they feel a touch; test all three branches, bilaterally (6 points total)
    • If a head and brainstem lesion is suspected, test bilaterally in all regions
  • Corneal reflex (special test, not routinely used)
    • Sensory testing of CN V with corneal reflex (blinking) via gentle contact with the sclera
    • Also involves CN VII; typically reserved for suspected lesions or coma
  • Practical note
    • Avoid stroking across dermatomes (e.g., ophthalmic to maxillary) when testing light touch
    • Pain testing (sharp/dull) is described in Bates and other sources; verbalize the pattern and spectrum of sensory testing

CN VII — Facial

  • Motor testing to assess symmetry of facial expressions: raise eyebrows, close eyes, show teeth, smile, puff cheeks, etc.
  • Observe symmetry and strength of movements on both sides

CN VIII — Vestibulocochlear

  • Hearing assessment
    • Whisper test or finger rub; ensure opposite ear is occluded and patient covers the mouth while you’re whispering from about 6 ext{ inches} away
    • For whisper tests, remove visual cues by turning away or covering mouth so the patient cannot read lips
  • Alternative method: follow Bates’ visual guide for hearing tests

CN IX — Glossopharyngeal and CN X — Vagus

  • Phonation assessment: listen to voice quality during conversation or direct task—check for hoarseness or nasal quality
  • Patient says “ah” to observe velopharyngeal movement; look for symmetric elevation of the soft palate and uvula; gag reflex testing involves CN IX and X
  • Mallampati score (for airway assessment) may affect visualization but is not a core component of the routine neuro exam
  • Tongue blade and light source may be used to ensure adequate airway visualization; consider Mallampati score when contemplating intubation risk

CN XI — Spinal Accessory

  • Test trapezius and sternocleidomastoid strength
    • Place hands on patient’s shoulders and apply resistance while the patient turns his/her head against your hand
    • Have the patient turn the head to each side against resistance

CN XII — Hypoglossal

  • Tongue protrusion and deviation
    • Have the patient stick out the tongue; a deviation to one side suggests a hypoglossal nerve (CN XII) lesion
  • Look for fasciculations and overall tongue strength

Coordination, Gait, and Motor System

  • Coordination (cerebellar and non-cerebellar components)
    • Rapid alternating movements (RAMs) of upper and lower extremities
    • Upper extremities RAMs: rapid “hand flaps” on the thigh, switching between back of hand and palm
    • It should be coordinated and smooth, not floppy or listless
    • Point-to-point testing of upper extremities: touch your finger to your nose while moving the examiner’s finger; keep a reasonable arm distance to test coordination
    • For lower extremities RAMs: toe tapping on the hand or table (heel-toe tapping on the shin is used for coordination)
    • Gait assessment
    • Stand, then walk away, turn, and return; evaluate turns (e.g., Parkinsonian short steps), tandem walking (tightrope walk), walking on toes and then on heels
    • Optional: hop in place or perform shallow knee bends to test lower limb strength and control
    • Romberg test and Pronator drift
    • Romberg: feet together, eyes closed; watch for swaying due to proprioceptive loss or sensory deficit
    • Pronator drift: arms extended with palms supinated; patient closes eyes; look for rapid pronation or drift if motor or proprioceptive pathways are impaired
  • Motor system exam (corticospinal tract focus)
    • Observe for muscle atrophy, fasciculations, tics, tremors; assess tremor presence with hands held out for several seconds
    • Tone assessment (resistance to passive stretch; “a wave” test): move arm through shoulder, elbow, wrist, and hand to assess resistance
    • Bilateral testing of tone and motor strength in both upper and lower limbs
    • Strength testing specifics
    • Elbow flexion/extension with resistance
    • Wrist extension and flexion with resistance (remember: wrist movements can be in flexion/extension and can involve pronation/supination)
    • Grip strength: patient squeezes your fingers; test resistance
    • Finger abduction: spread fingers; can assess overall strength
    • Thumb opposition: make an OK sign with the thumb and finger; assess opposing strength
    • Lower extremity strength
    • Hip flexion/extension; knee extension/flexion (note: some positions require seated testing, others easier when standing)
    • Ankle dorsiflexion/plantarflexion (toes toward nose and push away)
  • Sensory testing (general approach)
    • Scatter stimuli to avoid predictability; use light touch and pain (sharp/dull)
    • Tools and patterns used for testing
    • Light touch: cotton ball or gauze; say “now” every time you feel a sensation
    • Pain testing: sharp vs dull; verbalize as you perform
    • Bilateral testing and dermatomal mapping
    • Test C4–C8 (upper extremities) and L2–S1 (lower extremities); note the thumb (CN V6) and the fifth finger (CN VIII/HD? Note: for sensory mapping, C6 is thumb, C7 is middle finger, C8 is pinky)
    • Test bilaterally; variability in order is okay
    • Pain testing and verbalization: always verbalize sensations when testing
  • Special sensory and discriminative senses
    • Proprioception/position sense: grasp lateral toe or finger, place in a position with eyes closed, patient indicates up/down or position
    • Stereognosis: patient closes eyes and identifies objects placed in the palm; have at least two objects (e.g., paper clip, coin)
    • Graphethisia (draw a number on the hand) and patient identifies the number while eyes closed
    • Two-point discrimination: use a paperclip or other device to test with multiple points; determine the smallest distance at which two points are felt as distinct
    • Point localization: with eyes closed, examiner touches a point and patient reports or points to the same spot after opening their eyes; typically test two points upper and two points lower, though there is debate about minimum numbers
    • Extinction: test two points simultaneously; patient should localize where touched; if not, test one point at a time to confirm perception
  • Notes on testing patterns and scope
    • The bare minimum rule of thumb for discriminative senses is often two upper and two lower, but Bates materials don’t specify a fixed minimum; adapt as needed for clinical context
    • When in doubt, map the deficits to the neuroanatomy to guide differential diagnosis and imaging decisions

Headache Evaluation: Bates Box 24-4 and 24-5 Overview

  • Purpose and context
    • Headache evaluation often begins clinically with a primary headache diagnosis and conservative management
    • Red flags may prompt imaging or more urgent evaluation; this section outlines when imaging is indicated within headache presentations
    • Bates Table 24-4 (primary headaches) and Table 24-5 (secondary headaches) summarize typical features
  • Primary headaches (three main types plus chronic daily headache)
    • Migraine: unilateral or unilateral with throbbing; duration and associated symptoms (photophobia, phonophobia, nausea); aura occurs in about 30\% of cases; onset can be gradual or rapid, with variability across individuals
    • Tension-type headache: band-like pain; often associated with sustained muscle tension and stress; photophobia/phonophobia may be present; nausea less common
    • Cluster headache: severe unilateral headache with ipsilateral autonomic symptoms; onset is abrupt, duration episodic with clusters separated by pain-free periods; alcohol may trigger an increase in frequency
    • Chronic daily headache: headaches occurring on 15+ days per month, with a broad range of etiologies; often requires review of chronic pain patterns and potential medication overuse
  • Secondary headaches (non-primary etiologies often requiring imaging or further workup)
    • Analgesic rebound headaches: due to medication overuse or withdrawal; consider patterns of analgesic intake and rebound effects; fever, carbon monoxide exposure, and hypoxia can aggravate or trigger headaches
    • Eye-related headaches: due to eye disorders (visual strain, refractive errors such as farsightedness); may present with eye pain, eye fatigue, and photophobia
    • Sinus-related headaches: inflammation or swelling in paranasal sinuses; pain worsened by leaning forward or coughing; not a true primary headache
    • Meningitis: viral or bacterial; fever, neck stiffness; acute onset with systemic symptoms
    • Subarachnoid hemorrhage or ruptured aneurysm: thunderclap “worst headache of life”; often with acute neuro signs; may require immediate imaging
    • Intracranial mass or tumor: headaches with nonspecific, variable symptoms; localization depends on tumor location; associated symptoms may include seizures, hemiparesis, visual changes, gait changes, nausea/vomiting
    • Giant cell (temporal) arteritis: unilateral or unilateral-with-predominant temporal pain; jaw claudication; risk in older adults; prompt evaluation required to prevent vision loss
    • Post-concussion headache: post-traumatic headache with onset following head injury; duration may range from days to months; associated with drowsiness, confusion, exertional aggravation
    • Trigeminal neuralgia: cranial nerve V pain; sudden, sharp stabbing episodes triggered by chewing or tapping on the cheek; extremely painful and often prompting early clinical contact
  • Red flags and imaging indications
    • Subtle but important cues: new-onset headache after age 50, sudden worst headache of life, progressive change in pattern, neurologic deficits, new headaches with exertion or associated systemic illness, or headaches with papilledema on exam
    • In vignette questions, imaging is often the next step if red flags are present or if secondary etiologies are suspected
  • Practical notes on Bates resources
    • The purple checklist on your handout is a concise reference but not the only way to study; the end-of-chapter tables (Table 24-4 and 24-5) provide structured summaries of primary vs secondary headaches
    • Bates tables are useful review aids, and the summary materials complement asynchronous/presentation content
  • Diagnostic reasoning and differential diagnosis in headaches
    • Location, duration, onset, and quality help differentiate migraine, tension, and cluster headaches
    • Associated symptoms (photophobia, phonophobia, nausea) help characterize migraines and tension headaches; for cluster headaches, autonomic symptoms are more prominent
    • Triggers and response to relief measures (rest, NSAIDs, caffeine) inform management; cluster headaches often have limited relief with standard therapies
  • Practical clinical discussion points for students
    • Consider how to classify a headache in a vignette using key features: duration, pattern, associated symptoms, triggering factors, and response to treatment
    • When multiple etiologies fit, prioritize red flags and consider neuroimaging
    • In clinical education, acknowledge variability in practice guidelines and the importance of aligning with exam authors and institutional protocols

Case-based and Exam Preparation Notes

  • Practice approach to neuro exam questions

    • Be able to discuss why a given test is performed and what deficit would imply about neuroanatomy
    • Practice verbalizing the rationale for each step of the exam even when you’re not performing all maneuvers in real life
    • Use this as an opportunity to connect theory (neuroanatomy) with clinical practice (headache, stroke workups, concussion assessments)

  • Headache-focused exam practice

    • Be prepared to identify primary vs secondary headache features and the associated red flags that warrant imaging
    • Recall common secondary headache etiologies and their red flags (e.g., meningitis symptoms, giant cell arteritis signs, post-concussion patterns, sinusitis symptoms, ocular pathology)

  • Study strategies and classroom tips mentioned

    • Create a simple checklist and try to write out the cranial nerves and test sequence quickly as a timed exercise
    • Use a mnemonic or quick diagram to map each nerve to its exam components and expected findings
    • For discriminative senses (two-point discrimination, stereognosis, graphaesthesia, extinction, localization), practice a few rounds with two upper and two lower test sites as a starting point, then adapt based on clinical context

  • Logistics and course notes (context from the session)

    • Headache cases in the Canvas platform; there are neuroimaging cases (6–9) to discuss next session
    • Aimed to integrate neuro exam findings with history to develop differential diagnoses
    • Women’s health chapters follow neuro in the Bates curriculum; a substitute instructor and planned case discussions will address pelvic exam concepts in subsequent weeks
    • Assignment changes: videos and peer review components were adjusted; videos will be uploaded for formative assessment; adjunct faculty will review

  • Quick reference reminders for exam day

    • Always compare bilaterally for sensory and motor testing
    • Document references to your neuroanatomy mapping (e.g., posterior columns for vibratory sense, corticospinal tract for tone/strength, spinothalamic tract for pain) to justify your test choices
    • For headaches, be ready to discuss red flags and indicate whether imaging is indicated based on the vignette
    • When uncertain, describe the rationale and next steps (e.g., order imaging, refer to a specialist, or provide conservative management) to demonstrate clinical reasoning

  • Final practical note

    • The exam content deeply integrates Bates materials, clinical neuroanatomy, and practical bedside skills; focus on understanding “why” behind each test and how it guides diagnosis and management

  • Appendix: Quick glossary of terms encountered

    • Accommodations: near reaction tied to pupillary constriction during focus on near objects
    • Afferent/efferent pathways: concepts used to reason about lesions (optic nerve vs tract; cranial nerves involved in reflexes)
    • Pronator drift: a sign of motor or proprioceptive deficit when arms pronate and drift downward with eyes closed
    • Stereognosis: object identification by touch with eyes closed
    • Graphethesia: tracing or identifying numbers drawn on the hand
    • Two-point discrimination: smallest distance at which two points can be perceived as distinct
    • Romberg: postural stability test focusing on proprioception and sensory pathways
    • Detection vs extinction: distinguishing between single vs simultaneous sensory stimuli and patient’s ability to localize touch

  • Encouragement to practice

    • Create a short, time-bound self-test to recite the Cranial Nerve order, their primary functions, and a quick test method for each
    • Memorize key red flags for headaches and the basic primary/secondary headache differences to aid rapid clinical reasoning during exams