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Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
Sensory disturbances at the level of thalamus and cortex
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Sensory disturbances at the level of thalamus and cortex

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  • 1. SENSORY DISTURBANCES AT THE LEVEL OFTHALAMUS AND CORTEX
  • 2. SENSORY DISTURBANCESNEUROLOGICAL NON NEUROLOGICAL• PN, NR,SpC,BS, Thala • HYSTERICAL mus, Cortex
  • 3. SOMATIC SENSATIONSSUPERFICIAL DEEP COMBINED/ CORTICALPAIN VIBRATION TWO POINT DISCRIMINATION, TACTILE LOCALISATIONTEMPERATURE POSITION STEREOGNOSIS , GRAPHAESTHESIATOUCH PASSIVE MOVT DOUBLE SIMULTANEOUS
  • 4. PATHWAYSSPINOTHALAMIC DORSAL COLUMN• ANT- crude touch • Fine touch• LAT- pain, • Position sense temperature • Vibration
  • 5. Figure 26.18 The main somatic sensory pathways. Downloaded from: StudentConsult (on 5 July 2011 01:13 AM) © 2005 Elsevier
  • 6. THALAMUSForms the lateral wall of 3rd ventricleSupply: POST. CEREBRAL ASENSORY RELAY CENTRE- ‘HEAD GANGLION OF ALL SENSORY SYSTEMS’PROCESSING OF SENSATIONS- ‘Fnl gateway of cerebral cortex’
  • 7. PARTS1.Ant. Nuclei2.Med. Nuclei3.Lat. Nuclei [Largest;neothalamus]4.Intralaminar N
  • 8. LATERAL NUCLEI DL VMANT INT POST LAT[VPL] MED[VPM]
  • 9. SPINAL,MEDIAL TRIGEMINAL LEMNISCI LEMNISCI VPL VPM AREA 3,1,2
  • 10. THALAMIC LESIONSC/L loss of all sensationsTHALAMIC SYNDROME:-Lacunar infarction1. c/l sensory loss2. Thalamic/ athetoid hand3. Intention tremor4. Choreoathetosis
  • 11. 5. Thalamic over-reactioneg; DEJERINE ROUSSY SYNDROME- agonizing pain in the affected areaRx: frontal lobotomy6. Amelognosis7. Thalamic phantom limb8.Mild hemiparesis
  • 12. CORTEXPARIETAL CORTEXCORTICAL Br of MCA n ACAPrimary sensory area-3,1,2Sec sens areaSensory assosn area-5,7,40
  • 13. CORTICAL LESIONS c/l Cortical sensations are lost Hemi neglect,hemi inattention Simulate paralysisPseudothalamic syndrome-Cortical lesion with c/l loss of sensationsAnt. Parietal infarctionSimulate thalamic lesion
  • 14. LAT MED
  • 15. Thalamic lesion Cortical lesionpain + _Tingling nnumbness + _Perception ofsensation _ +Loss ofdiscrimination _ +

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