Questions
1–2 long answer or clinical case questions per paper
Difficulty
Medium-Hard
Importance
High yield for BPT and medical board finals
Overview
Neurological assessment is a cornerstone of clinical practice used to evaluate the functional integrity of the central and peripheral nervous systems. Mastery of these physical examination techniques is essential for localizing lesions and monitoring the progression of neurological disorders, making it a high-yield topic for both written theory exams and clinical vivas.
Tone Assessment
Muscle tone is defined as the continuous, passive partial contraction of muscles at rest, maintained by the stretch reflex arc and higher inhibitory centers. Assessment involves passive movement of limbs through their full range of motion to detect resistance or flaccidity.
- Hypertonia: UMN lesions leading to Spasticity (velocity-dependent) or Rigidity (velocity-independent).
- Hypotonia: LMN lesions, cerebellar disease, or shock resulting in flaccid muscles.
- Modified Ashworth Scale: Standard clinical tool for grading spasticity from 0 to 4.
- Lead-pipe vs. Cogwheel rigidity: Key descriptors for Parkinsonian rigidity.
Reflex Testing
Reflexes provide a window into the integrity of the reflex arc, spanning from sensory receptors to spinal cord levels and motor output. Testing involves mechanical stimulation of tendons using a reflex hammer, typically graded on a 0 to 4 scale.
- Grade 0: Areflexia; Grade 2: Normal; Grade 4: Hyperreflexia with clonus.
- Deep Tendon Reflexes: Biceps (C5-C6), Brachioradialis (C5-C6), Triceps (C7-C8), Knee (L3-L4), Ankle (S1-S2).
- Babinski Sign: Indicative of UMN lesion if the great toe extends upon sole stimulation.
- Jendrassik maneuver: Reinforcement technique to elicit masked reflexes.
Sensory Examination
Sensory examination evaluates the integrity of the somatosensory pathways, including the dorsal column-medial lemniscal system and the spinothalamic tracts. It is divided into superficial, deep, and cortical sensation assessments to localize neurological deficits accurately.
- Superficial Sensation: Touch, pain (pinprick), and temperature.
- Deep Sensation: Proprioception (joint position sense) and Vibration (pallesthesia).
- Cortical Sensation: Stereognosis, Graphesthesia, and Two-point discrimination.
- Dermatomal Mapping: Critical for localizing spinal nerve root involvement.
Exam Tip
Always correlate your assessment findings (e.g., hyperreflexia) with the specific anatomical location of the lesion (e.g., Upper Motor Neuron) to secure full marks in clinical reasoning questions.
Common Mistakes
- Confusing velocity-dependent spasticity with non-velocity-dependent rigidity during assessment.
- Failing to use reinforcement maneuvers when reflexes appear absent on initial testing.
- Neglecting to document dermatomal levels accurately during sensory distribution testing.
More Revision Notes
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