Neurological assessment for bsc nursing how to do it wht to assess from head to toe including 12 pair cranial nerves and reflexes
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I now have excellent content from Harrison's and S. Das for a comprehensive neurological assessment guide. Let me compile the full answer:
Neurological Assessment - B.Sc. Nursing (Head to Toe)
Overview of Components
A complete neurological assessment covers six major domains, assessed in this order:
- Mental Status / Level of Consciousness
- Cranial Nerves (I-XII)
- Motor Function
- Sensory Function
- Reflexes
- Cerebellar / Coordination / Gait
Note: The neurological exam begins the moment you first observe the patient - handshake, gait, facial expression, and manner of dress all provide early clues.
STEP 1: MENTAL STATUS ASSESSMENT
A. Level of Consciousness (LOC)
The patient's state of awareness of self and environment, ranging from fully awake to comatose.
- Alert - Awake, responds normally to stimuli
- Confused/Disoriented - Responds but is not fully oriented
- Lethargic - Drowsy but arousable by verbal stimuli
- Stuporous - Arousable only by vigorous/painful stimuli
- Comatose - No purposeful response
Glasgow Coma Scale (GCS) - use for quantification:
| Component | Best Response | Score |
|---|---|---|
| Eye Opening | Spontaneous / To voice / To pain / None | 4-1 |
| Verbal | Oriented / Confused / Inappropriate / Sounds / None | 5-1 |
| Motor | Obeys / Localizes / Withdraws / Flexion / Extension / None | 6-1 |
- Total: 15 = normal; <8 = severe impairment (coma)
B. Orientation (3 Spheres)
Ask the patient: name, place, and time (day, date, month, year).
- Time orientation is usually the first to be affected.
C. Speech & Language
- Articulation - assess for dysarthria (slurred/mumbled speech)
- Rate, rhythm, prosody
- Ask patient to name objects, repeat phrases ("No ifs, ands, or buts"), follow a 3-step command, write a sentence
D. Memory
- Immediate - Repeat 3 items right away
- Short-term - Recall same 3 items after 5 and 15 minutes
- Long-term - Chronological account of illness or personal history
E. Other Higher Functions
- Fund of information - general knowledge questions
- Abstract thinking - similarities between objects (e.g., "How are an apple and orange alike?")
- Calculations - Serial 7s (subtract 7 from 100 repeatedly) or serial 3s
- Insight and Judgment - response to hypothetical scenarios ("What would you do if you found a wallet?")
- Use Mini-Mental State Examination (MMSE) (max score 30) for standardized cognitive screening
STEP 2: CRANIAL NERVE EXAMINATION (All 12 Pairs)
| CN | Name | Type | How to Test | Normal Finding |
|---|---|---|---|---|
| I | Olfactory | Sensory | Block one nostril; ask patient to identify smell of coffee, toothpaste (eyes closed) | Identifies odor correctly; anosmia = frontal lobe/meningioma |
| II | Optic | Sensory | (a) Visual acuity - Snellen chart; (b) Visual fields - confrontation test (move finger from periphery toward center in all 4 quadrants); (c) Fundoscopy - examine optic disc, retina | 6/6 vision; full visual fields; normal optic disc |
| III | Oculomotor | Motor | Inspect pupil size/shape; PEARL (Pupils Equal And Reactive to Light); accommodation reflex (near/far); ask patient to follow finger in H-pattern; check ptosis | Pupils 2-5 mm, equal; brisk reaction; no ptosis, no diplopia |
| IV | Trochlear | Motor | Ask patient to look downward and inward; test with H-pattern eye movement | No diplopia on downward gaze |
| V | Trigeminal | Mixed | (a) Sensory: touch/pin-prick to 3 divisions - forehead (ophthalmic V1), cheeks (maxillary V2), chin (mandibular V3); (b) Corneal reflex - wisp of cotton; (c) Motor: ask patient to clench jaw; palpate masseter | Intact sensation all divisions; blink on corneal touch; symmetric jaw strength |
| VI | Abducens | Motor | Ask patient to look laterally (outward); tested in H-pattern | Full lateral gaze, no medial squint |
| VII | Facial | Mixed | Inspect face at rest for asymmetry; test: (a) eyebrow raise, (b) forehead wrinkle, (c) eye closure against resistance, (d) smile/show teeth, (e) cheek puff; taste anterior 2/3 tongue (sweet/salty) | Symmetric movements bilaterally |
| VIII | Vestibulocochlear | Sensory | (a) Hearing: whispered voice or finger rub at 2 feet; (b) Rinne test: air vs bone conduction (tuning fork); (c) Weber test: lateralization; (d) Vestibular: Romberg test, balance | Hears whisper; AC > BC; no lateralization |
| IX | Glossopharyngeal | Mixed | Gag reflex (posterior pharynx); taste posterior 1/3 tongue | Gag present; taste intact |
| X | Vagus | Mixed | Ask patient to say "Ah" - observe uvular deviation and palate rise; assess voice (hoarseness) | Uvula midline, palate rises symmetrically |
| XI | Accessory | Motor | (a) Shrug shoulders against resistance (trapezius); (b) Turn head against resistance (sternocleidomastoid) | Full strength bilaterally |
| XII | Hypoglossal | Motor | Ask patient to protrude tongue - observe for deviation, fasciculations, atrophy | Tongue midline; no fasciculations or atrophy |
STEP 3: MOTOR FUNCTION
A. Observation
- Posture, bulk, fasciculations, tremors, athetosis, abnormal movements
B. Muscle Tone
- Passively move limbs and feel for resistance
- Flaccid (lower motor neuron lesion) vs. Spastic (upper motor neuron lesion) vs. Rigid (extrapyramidal)
C. Muscle Strength (MRC Grade Scale)
| Grade | Description |
|---|---|
| 0 | No contraction |
| 1 | Flicker/trace contraction |
| 2 | Movement with gravity eliminated |
| 3 | Movement against gravity |
| 4 | Movement against some resistance |
| 5 | Normal full strength |
- Test: shoulder abduction, elbow flexion/extension, wrist extension, finger grip, hip flexion/extension, knee flexion/extension, ankle dorsiflexion
D. Involuntary Movements
- Tremor (Parkinson's = resting tremor; cerebellar = intention tremor)
- Fasciculations - spontaneous muscle twitching (lower motor neuron)
- Athetosis - slow writhing movements
- Tics - repetitive stereotyped movements
STEP 4: SENSORY FUNCTION
A. Superficial (Cutaneous) Sensation
- Light touch - cotton wisp; compare bilaterally dermatomally
- Pain (pin-prick) - use sterile pin; ask "sharp or dull?"
- Temperature - warm/cold tubing or tuning fork
B. Deep Sensation
- Vibration - tuning fork (128 Hz) on bony prominences (malleolus, wrist, sternum)
- Proprioception (Joint position sense) - move distal joint (big toe) up/down with eyes closed; patient states direction
- Stereognosis - patient identifies object (coin, key) by feel alone (eyes closed)
- Graphesthesia - write number on patient's palm; patient identifies it with eyes closed
- Two-point discrimination - two points applied simultaneously; patient says if one or two points felt
STEP 5: REFLEXES
A. Deep Tendon Reflexes (DTRs) - Graded 0 to 4+
| Grade | Meaning |
|---|---|
| 0 | Absent |
| 1+ | Hypoactive (diminished) |
| 2+ | Normal |
| 3+ | Brisk (may be normal) |
| 4+ | Clonus (pathological) |
| Reflex | Spinal Level | How to Elicit |
|---|---|---|
| Biceps jerk | C5, C6 | Place thumb on biceps tendon; tap thumb; elbow slightly flexed |
| Triceps jerk | C7 | Tap just above olecranon with elbow flexed at 90° |
| Brachioradialis | C5, C6 | Tap styloid process of radius with hammer |
| Knee jerk (patellar) | L2, L3, L4 | Tap ligamentum patellae below patella; legs hanging or crossed |
| Ankle jerk | S1, S2 | Dorsiflex foot slightly; tap Achilles tendon |
B. Superficial Reflexes (Skin Reflexes)
| Reflex | Level | How to Elicit | Response |
|---|---|---|---|
| Plantar reflex | S1 | Stroke outer border of sole with blunt instrument | Normal: flexion of toes (plantar flexion) |
| Babinski's sign | Pyramidal tract | Same as plantar | Abnormal: extension (dorsiflexion) of great toe + fanning of others - indicates upper motor neuron lesion |
| Abdominal reflexes | T7-T11 | Stroke abdominal wall parallel to costal margins/iliac crest | Umbilicus moves toward stimulus; absent in pyramidal lesions |
| Cremasteric reflex | T12, L1 | Stroke inner thigh | Ipsilateral testicular elevation (males) |
C. Pathological Reflexes to Check
- Ankle clonus - Sudden dorsiflexion of foot; sustained rhythmic oscillation = pyramidal lesion
- Patellar clonus - Sudden downward push on patella; rhythmic patella movement = pyramidal lesion
- Hoffmann's reflex - Flick middle fingernail; flexion of thumb/index finger = upper motor neuron sign
- Kernig's sign - Hip flexed 90°, extend knee; pain/resistance = meningeal irritation
- Brudzinski's sign - Passive neck flexion causes involuntary hip/knee flexion = meningeal irritation
STEP 6: CEREBELLAR FUNCTION & COORDINATION
| Test | Technique | What it Detects |
|---|---|---|
| Finger-nose-finger | Touch examiner's finger then own nose alternately (eyes open then closed) | Dysmetria, intention tremor |
| Heel-shin test | Place heel on opposite knee and slide down shin (supine, eyes closed) | Limb ataxia |
| Rapid alternating movements | Pronation/supination of forearm rapidly | Dysdiadochokinesia (cerebellar lesion) |
| Romberg's test | Stand feet together, arms at sides, eyes open then closed; look for swaying/falling | Sensory ataxia (positive) vs. cerebellar ataxia |
| Gait assessment | Normal gait, tandem (heel-toe) walking, walking on heels, walking on toes | Ataxia, hemiplegia, parkinsonian shuffle |
Key cerebellar signs: Dysdiadochokinesia, Dysmetria, Ataxia, Nystagmus, Intention tremor, Dysarthria (DANISH mnemonic - Dysdiadochokinesia, Ataxia, Nystagmus, Intention tremor, Slurred speech, Hypotonia)
STEP 7: VITAL SIGNS RELATED TO NEURO (Cushing's Triad)
Always check BP, HR, and RR in neurological assessment:
- Cushing's Triad = Hypertension (widened pulse pressure) + Bradycardia + Irregular respirations - indicates raised intracranial pressure (ICP)
QUICK SUMMARY TABLE: Head-to-Toe Neuro Assessment
| Region/System | What to Assess |
|---|---|
| Head/Face | LOC, GCS, orientation, mental status, CN I-XII, facial symmetry |
| Eyes | Pupils (PEARL), visual acuity/fields (CN II), EOM (CN III/IV/VI), fundoscopy |
| Ears | Hearing (CN VIII), Rinne/Weber tests |
| Nose | Smell (CN I) |
| Mouth/Throat | Taste (CN VII, IX), gag reflex (CN IX/X), tongue (CN XII), voice (CN X) |
| Neck | Neck stiffness (meningism), strength (CN XI), Kernig/Brudzinski |
| Upper Limbs | Tone, strength (MRC), sensation, DTRs (biceps C5/6, triceps C7, brachioradialis C5/6), coordination |
| Lower Limbs | Tone, strength, sensation, DTRs (knee L2-4, ankle S1-2), Babinski, ankle clonus |
| Trunk | Abdominal reflexes (T7-11), sensory level |
| Gait | Normal, heel-toe (tandem), Romberg's test |
KEY MNEMONICS FOR BSc NURSING
12 Cranial Nerves - "Oh, Oh, Oh, To Touch And Feel Very Good Velvet - Ahh Heaven!"
- I: Olfactory | II: Optic | III: Oculomotor | IV: Trochlear | V: Trigeminal | VI: Abducens | VII: Facial | VIII: Vestibulocochlear | IX: Glossopharyngeal | X: Vagus | XI: Accessory | XII: Hypoglossal
Nerve Type - "Some Say Marry Money But My Brother Says Bad Business Marry Money"
(S = Sensory, M = Motor, B = Both)
- I-S, II-S, III-M, IV-M, V-B, VI-M, VII-B, VIII-S, IX-B, X-B, XI-M, XII-M
Sources: Harrison's Principles of Internal Medicine 22E (2025) | Goldman-Cecil Medicine | S. Das Manual on Clinical Surgery 13th Ed. | Adams and Victor's Principles of Neurology
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