Download - Localization in the Neuraxis
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Fawaz Al-hussainAssistant ProfessorStroke Neurologist
ForInternal Medicine Round
Nov.10th/2010
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Localization is important• investigation modalities differ widely
depending upon the level affected
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Higher Cortical Function Cranial Nerves Motor Sensory Deep Tendon Reflexes Coordination Special tests Gait
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Depends upon hemispheric dominance
Non-neurologists generalize:•right: visual/spatial, perception and
memory• left: language and language dependent
memory
Through detailed examination, neurologists should lateralize and localize within a lobe
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Frontal Lobe:• L:
Broca’s Aphasia• R: ?• Both:
Primary motor cortex: motor homunculous supplementary motor cortex: Voluntary eye field prefrontal cortex: personality, initiative
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Parietal Lobe:R:
Lt hemispatial neglectdressing and constructional apraxia
L:Gerstman’s Tetrad: L/R confusion, finger agnosia,
acalculia, agraphia without alexiaWerneke’s Aphasia (with Temporal lobe)
Both: cortical sensory modalities
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Temporal: Auditory cortex: Heschel’s gyrus learning and memory: mid/inferior gyri olfaction: limbic system (Lt): Werneke’s Aphasia
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Occipital Lobe: Micropsia/ macropsia visual hallucinations: elemental and unformed prosopagnosia: familiar faces cortical blindness: striate cortices, normal pupil
rx
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Deep white radiating fibers• weakness• sensory abnormalities
Visual radiating fibers: • deep parietal: bilateral inferior
homonomous quadronopsia • deep temporal (Meyer’s loop): bilateral
superior homonomous quadronopsia
Basal Ganglia: extrapyramidal signs
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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The Brainstem is basically spinal cord with embedded cranial nerves• Cranial neuropathies• Long Tract signs: (bilateral and crossed)
corticospinal (pyramidal): motor spinothalamic: pain/temp dorsal columns: proprioception/vibration Autonomic dysfunction (LOC, eyes, mouth,
heart, breathing)
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Pure cerebellar signs cerbellum
Cerebellar and long tracts’ signs brainstem
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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3 Functions: Motor UMNL Sensory Autonomic
Key ? sensory level
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Motor neurons (upper &
lower) Root Peripheral Nerve Neuromuscular Junction Muscle
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Pure motor deficit(s)
Upper (primary Lateral sclerosis) in motor cortex
Lower motor neurons in spinal cord
Spread: leg arm bulbar bulbar arm and leg
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Radicular pain: hallmark
Sensory abnormalities in a dermatomes
Weakness in a myotomal distn
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Weakness (LMN) Numbness +/- autonomic
all are consistent with PN distribution
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Fatigability: hallmark
Weakness: proximal and symmetric•muscles have normal bulk and tone•EOMs, bulbar, arms, and legs
Sensation: preserved
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Cortical Brain Subcortical area Brainstem Cerebellum Spinal Cord Root Peripheral Nerve Neuromuscular Junction Muscle
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Weakness • Symmetric• Proximal• + atrophy & absent DTRs
Sensation is normal• though patients complain of cramping, &
aching• myalgia
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Accurate Hx and P/E are needed
Some neurologic diseases hit more than one level in the neuraxis
include all involved
Never fabricate part of the exam
Always localize before making DDx list
The localization plus the tempo of progression allow one to narrow a differential diagnosis
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32 y/o male with reduced endurance and mild weakness in his legs
His older brother has weakness too
P/E: mild atrophy in legs with fasciculation but increased muscle tone. (N) sensory exam
Localize?
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32 y/o male with reduced endurance and mild weakness in his legs
His older brother has weakness too
P/E: mild atrophy in legs with fasciculation but increased muscle tone. (N) sensory exam
Localize? Motor Neuron Disease familial ALS
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55 y/o lady with sudden diplopia and weakness in Rt (F,A,L)
Localize?
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55 y/o lady with sudden diplopia and weakness in Rt (F,A,L)
Localize? Midbrain lesion ischemic stroke
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75 y/o lady with increased misnaming stuff over 2 years
P/E: decreased lexical fluency and some paraphasic errors
No other neurological signs
Localize?
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75 y/o lady with increased misnaming stuff over 2 years
P/E: decreased lexical fluency and some paraphasic errors
No other neurological signs
Localize? Lt frontal lobe frontal dementia
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35 y/o man with Rt blindness, dysarthria, dysphagia, and weakness in Rt arm and leg plus Lt leg and sensory level at T-4
Localize?
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35 y/o man with Rt blindness, dysarthria, dysphagia, and weakness in Rt arm and leg plus Lt leg and sensory level at T-4
Localize? Multiple lesions at least brainstem and T-spine MS
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16 y/o girl with gait ataxia and poor coordination in 4 limbs
+ nystagmus when looks to Rt side
Localize?
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16 y/o girl with gait ataxia and poor coordination in 4 limbs
+ nystagmus when looks to Rt side
Localize? cerebellar spinocerebellar ataxia
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50 y/o lady with diplopia on/off worse at evenings
In exam: partial ptosis in Rt eye
Localize?
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50 y/o lady with diplopia on/off worse at evenings
In exam: partial ptosis in Rt eye
Localize? NM junction Myasthenia gravis