Localization of lesion in hemiplegia

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Localization of lesion in hemiplegia

  1. 1. LOCALIZATION OF LESION
  2. 2.  Inability to move a part – Paralysis Interruption of motor pathways between cerebral cortex and muscles Divided into UMN and LMN Both limbs on one side of body affected – Hemiplegia
  3. 3. FEATURES OF UMN LESIONS Weakness Distal muscle groups affected Axial movements, extraocular, upper facial, pharyngeal and jaw muscles are spared Hypertonia Deep reflex exaggerated Loss of abdominal reflex Extensor plantar No muscle wasting
  4. 4. COMPLAINTS OF UMN LESION Stiffness of legs Tendency to trip over Unable to walk on rough ground Difficulty to climb steps Dragging of foot
  5. 5. FEATURES OF LMN LESION Weakness Hypotonia Loss of tendon reflex Fasciculation of muscle Contracture of muscle Trophic changes
  6. 6. UMN LMNVoluntary activity lost, reflex Both voluntary and reflexactivity present activity lostSpastic paralysis due to Flaccid paralysis due tohypertonia, clasp knife hypotoniarigidity and ankle clonuspresentDeep reflexes are Both superficial and deepexaggerated due to reflexes absentincrease in muscle tone.Some of the superficialreflexes are lost and somealteredMuscle atrophy occur slowly Rapid muscular atrophyReaction of degeneration Reaction of degenerationabsent present
  7. 7. HOW TO LOCALIZE UMN LESIONScortex Paralysis on opposite side, extent depends on area involved. Unequal weakness of limbs Seizure + Aphasia + (if dominant hemisphere is involved) Loss of cortical sensation No movement disorder No visual field defect [except in occipital lobe involvement]
  8. 8. SUBCORTICAL / THALAMUS Paralysis on opposite side Unequal weakness of limb Loss of primary sensation Homonymous visual field defect No seizure/ no aphasia Movement disorder[BG – chorea, parkinsonism, hemibalallismus]
  9. 9. INTERNAL CAPSULE Dense hemiplegia and UMN facial palsyLesion extending posterior Hemianesthesia Homonymous hemianopia
  10. 10. MID BRAIN Crossed hemiplegia Weber syndrome [3rd nerve palsy] Benedicts syndrome [3rd nerve, red nucleus, cerebellar ataxia]
  11. 11. PONS Crossed hemipelgia Millard Gubler syndrome [6th and 7th nerve palsy] Lesion in basis pontis can cause ataxic hemiparesis [ weakness + cerebellar on same side]
  12. 12. MEDULLA Crossed hemiplegia Jackson syndrome [ 12th nerve palsy] Involvement of medial lemniscus leads to loss of sensation Cruciate hemiplegia
  13. 13. SPINAL CORD Brown sequard syndrome [hemiplegia on the side of involvement without face] lesion above C5 Effects below the level – UMN type motor loss and sensory loss At the level – LMN type Above the level – Hyperaesthesia
  14. 14. SPINAL CORD LESION
  15. 15. HOW TO LOCALIZE LMN LESIONPresenting Anterior horn Peripheral Neuromuscula Musclefeatures cell disease nerve r junction disease diseaseDistribution Asymmetric Symmetric Extra ocular, Symmetric limb/ bulbar and distal bulbar and proximal or proximal limb distal limb muscles musclesMuscle Marked and Moderate None Early stage –atrophy early slight Late – markedSensory None Parasthesia None NoneinvolvementCharacteristic Fasciculation Combined Diurnal Usuallyfeatures and cramps sensory and fluctuation proximal motor involvementReflex Variable Decreased Normal Decreased
  16. 16. EXTRA PYRAMIDAL SYSTEM Difficulty to initiate movements Hypertonia – rigidity [cog wheel] No loss of power of muscles and wasting Bradykinesia or akinesia Involuntary movement Plantar response – Flexor
  17. 17. CEREBELLAR LESION Ataxia Nystagmus Dysarthria Intension tremor Hypotonia Dysdiadocokinesis Plantar response – Flexor Paralysis is not a feature of cerebellar disease

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