01Principles and purposeThe professional or clinical skill and the decisions it supports.
Neurological examination is a set of experiments designed to locate dysfunction. A complete screening routine has value, but the history determines which pathways need dense testing. Begin by observing interaction, language, facial symmetry, spontaneous limb use, involuntary movement and transfers. Establish handedness or baseline function when relevant. Explain that some tasks test strength, sensation, vision, balance or coordination; gain consent and check pain, hearing, vision and language needs. Fatigue changes performance, so sequence demanding tasks thoughtfully. Never test gait without evaluating whether the person can stand safely and whether an aid or assistant is needed.
Build each conclusion from internally consistent observations. For power, stabilise the joint and compare sides while allowing a genuine effort; note pain, comprehension and fatigability. Tone depends on relaxation and speed of movement. Reflexes require comparable technique and reinforcement where appropriate. Sensory testing uses a demonstrated stimulus, unpredictable timing and mapped boundaries; closed eyes are only useful if safe and understood. Coordination tests may appear abnormal because of weakness, sensory loss, visual impairment or comprehension. Record what the patient could do, not merely a numerical grade detached from conditions.
Localisation is a hierarchy. Ask whether findings point to cortex, brainstem, cerebellum, spinal cord, nerve root, plexus, peripheral nerve, neuromuscular junction or muscle. Upper motor neuron patterns combine distribution, tone and reflex change; lower motor neuron patterns may include weakness, reduced reflexes, wasting or fasciculation. A single brisk reflex is not enough. A sensory level, sphincter symptoms and bilateral motor signs raise spinal cord concern, whereas a named peripheral nerve pattern requires compatible motor and sensory anatomy. Multifocal, inconsistent or functional features still require respectful assessment and should not be equated with fabrication.
Time course and urgency sit beside anatomy. Sudden onset supports vascular or seizure-related mechanisms; progression over hours, days or weeks changes the dangerous alternatives. Acute facial or limb weakness, new aphasia, visual loss, cauda equina symptoms, respiratory weakness or declining consciousness should interrupt a teaching performance. In a PACES-style discussion, present the syndrome and localisation before causes, then state relevant investigations and management priorities. Feedback should check patient safety, task instructions, anatomical logic, reproducibility and concise synthesis, then identify one technique and one reasoning target for practice.
Key points
- Observe speech, alertness, posture, movement and gait before formal testing; sudden focal deficit, seizure, reduced consciousness or rapidly progressive weakness requires immediate escalation.
- Explain the examination, obtain consent, ask about pain and fatigue, remove mobility hazards and use support when testing standing or gait.
- Choose components from the presenting problem: cognition, cranial nerves, limbs, coordination, sensation and gait should be broad enough to localise but not an unfocused recital.
- Test and describe findings by distribution, symmetry, modality, severity and reproducibility; distinguish inability to understand, pain-limited effort and fatigue from primary weakness.
- Localise before naming a cause: central versus peripheral, upper versus lower motor neuron, nerve root versus individual nerve, focal versus diffuse and static versus evolving.
- End with a one-sentence localisation, likely mechanisms, important alternatives, urgent action where needed, completion tests and acknowledgement of examination limits.
02Situations and prioritiesThe context, relevant information and actions that matter most.
New unilateral weakness, aphasia, neglect, visual field loss or cranial deficit with sudden onset demands urgent stroke-oriented assessment rather than completion of an exhaustive routine.
Bilateral signs below a level, upper motor neuron features, sensory level or autonomic disturbance suggest cord involvement and require rapid attention to compression or inflammation.
Weakness and sensory loss matching one nerve across more than one root can support focal neuropathy, but pain, effort and anatomical variation affect bedside mapping.
Fatigable ocular, bulbar or proximal weakness with preserved sensation may suggest junctional disease; swallowing or respiratory involvement changes urgency.
Dysmetria, intention tremor, dysdiadochokinesia, nystagmus and gait ataxia gain meaning as a cluster after weakness, sensory loss and drug effects are considered.
Variation can reflect fatigue, pain, attention, comprehension or functional neurological symptoms; describe positive observations and avoid moral interpretations.
03Assessment and interpretationHow to gather information, assess the situation and recognise uncertainty.
Consider the information, its meaning and its limitations before deciding what follows.
- 01
Focused mental status and language assessment - Why
- Identify cognitive, language or attentional factors that localise disease and affect validity of later tasks.
- Interpretation and limitations
- Separate dysphasia, dysarthria, inattention and reduced alertness because they change both localisation and the meaning of apparently poor cooperation.
- 02
Structured motor comparison - Why
- Map bulk, tone, power and reflexes across relevant muscle groups and levels.
- Interpretation and limitations
- Use patterns across several observations; isolated effort-dependent weakness or one reflex difference needs repetition and clinical context.
- 03
Mapped sensory examination - Why
- Test modalities and boundaries that distinguish cortex, cord, root and peripheral nerve hypotheses.
- Interpretation and limitations
- Demonstrate the stimulus and map from altered toward normal areas; patient reports are essential data, while inconsistent boundaries require careful retesting rather than dismissal.
- 04
Coordination and gait assessment - Why
- Assess cerebellar, sensory, vestibular and motor integration when safe.
- Interpretation and limitations
- Interpret performance alongside vision, strength, proprioception, footwear and baseline aids; never provoke unsupported walking in a person at risk of falling.
- 05
Urgent physiological and bedside assessment - Why
- Identify glucose disturbance, hypoxia and instability that may mimic or compound neurological deficit.
- Interpretation and limitations
- Record timing and act on dangerous abnormalities, but do not let a plausible metabolic contributor delay evaluation of a concurrent focal emergency.
- 06
Imaging or neurophysiology selection - Why
- Test the anatomical and mechanistic hypothesis formed from history and examination.
- Interpretation and limitations
- Brain or spinal imaging, nerve studies and other tests answer different questions; urgency and modality follow the syndrome rather than a generic completion list.
04Worked approachesCases with ordered reasoning, an action and a check of the outcome.
01Worked caseLocalise progressive leg findingsA fictional case supplies two weeks of worsening bilateral leg stiffness, urinary urgency, brisk knee reflexes, extensor plantar responses, reduced pinprick below the umbilical level and normal arm examination.+
- 1Confirm current mobility and bladder safety, assist transfers and identify whether progression, retention, severe back pain or new weakness requires immediate senior escalation.
- 2Group the supplied bilateral upper motor neuron signs and truncal sensory level, with arms spared, into a spinal cord syndrome rather than two unrelated peripheral nerve problems.
- 3Localise broadly to the thoracic cord from the sensory boundary and limb distribution while acknowledging that bedside levels are approximate and do not identify the lesion cause.
- 4Prioritise compressive, inflammatory and other structural mechanisms, arrange urgent specialist assessment and appropriate spinal imaging through the clinical pathway, and avoid delaying because symptoms evolved over weeks.
- 5Verify by checking that each sign supports the stated localisation, document gait testing limits, communicate uncertainty about cause, and obtain feedback on sensory mapping and escalation clarity.
02Focused limb examinationTest suspected radial nerve dysfunctionThe history suggests wrist drop after prolonged external pressure on the upper arm.+
- 1Inspect resting posture and wasting, then test power across muscles supplied at different levels while stabilising joints and comparing the opposite side.
- 2Map sensory change over a relevant radial distribution and test reflexes, taking care not to force a textbook boundary onto the patient's report.
- 3Check muscles from other nerves and roots to separate a focal nerve lesion from plexus, root or central weakness.
- 4Present the anatomical hypothesis, likely site, important alternatives and the role of follow-up or neurophysiology if recovery or diagnosis remains uncertain.
03Safe gait assessmentAssess balance without creating a fallA patient reports unsteadiness and normally uses a walking stick.+
- 1Inspect footwear and environment, ask about baseline aids and recent falls, and decide whether an assistant or support is necessary before standing.
- 2Observe rising, stance, initiation, stride, turning and sitting with the usual aid before adding more challenging tasks.
- 3Do not demand tandem gait or eyes-closed testing when the information would not justify the risk.
- 4Describe the observed gait pattern and limitations, help the patient sit safely, and link further examination to plausible sensory, motor, cerebellar or vestibular mechanisms.
05Feedback, follow-up and evidenceReview outcomes, seek feedback and identify what to improve.
- Repeat neurological findings when symptoms evolve, recording time precisely because change can alter localisation, urgency and eligibility for acute pathways.
- Compare bedside maps and power descriptions with imaging, neurophysiology and specialist assessment to calibrate anatomical reasoning.
- Review supervised technique for instructions, joint stabilisation, reflex symmetry, sensory mapping, fatigue recognition and fall prevention.
- Document baseline aids, examination limitations, collateral information, escalation and ownership of pending results or reassessment.
- Use feedback to identify whether the final presentation began with syndrome and localisation before producing a list of diseases.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
A sensory level is approximate
The perceived dermatome may not equal the precise anatomical lesion level; it is a powerful localisation clue that guides urgent imaging rather than a definitive measurement.
Weakness has testing conditions
Pain, poor joint stabilisation, comprehension and fatigue can change apparent power. Describe these factors and look for a coherent distribution before grading certainty.
Gait integrates many systems
An abnormal gait is not automatically cerebellar; vision, vestibular input, proprioception, strength, pain, cognition and medication effects all contribute.
Functional signs need respect
Positive internal inconsistency can support a functional formulation after appropriate assessment, but it does not justify accusing a patient of deliberate production.
Localisation directs testing
A clear anatomical hypothesis makes the next investigation defensible and prevents indiscriminate brain imaging when the supplied pattern points elsewhere.
07Common pitfallsFrequent interpretation and management errors.
- 01
Testing every cranial nerve while an acute focal deficit or declining consciousness calls for immediate emergency assessment.
- 02
Calling weakness lower motor neuron on the basis of one reduced reflex without a compatible anatomical pattern.
- 03
Interpreting dysmetria as cerebellar disease without accounting for weakness, impaired vision or sensory loss.
- 04
Asking an unsteady patient to walk unsupported or remove a usual aid simply to complete an assessment station.
- 05
Listing causes before stating the neurological syndrome and likely level of dysfunction.