Sensory disturbances at the level of thalamus and cortex

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Sensory disturbances at the level of thalamus and cortex

  1. 1. SENSORY DISTURBANCES AT THE LEVEL OFTHALAMUS AND CORTEX
  2. 2. SENSORY DISTURBANCESNEUROLOGICAL NON NEUROLOGICAL• PN, NR,SpC,BS, Thala • HYSTERICAL mus, Cortex
  3. 3. SOMATIC SENSATIONSSUPERFICIAL DEEP COMBINED/ CORTICALPAIN VIBRATION TWO POINT DISCRIMINATION, TACTILE LOCALISATIONTEMPERATURE POSITION STEREOGNOSIS , GRAPHAESTHESIATOUCH PASSIVE MOVT DOUBLE SIMULTANEOUS
  4. 4. PATHWAYSSPINOTHALAMIC DORSAL COLUMN• ANT- crude touch • Fine touch• LAT- pain, • Position sense temperature • Vibration
  5. 5. Figure 26.18 The main somatic sensory pathways. Downloaded from: StudentConsult (on 5 July 2011 01:13 AM) © 2005 Elsevier
  6. 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. 7. PARTS1.Ant. Nuclei2.Med. Nuclei3.Lat. Nuclei [Largest;neothalamus]4.Intralaminar N
  8. 8. LATERAL NUCLEI DL VMANT INT POST LAT[VPL] MED[VPM]
  9. 9. SPINAL,MEDIAL TRIGEMINAL LEMNISCI LEMNISCI VPL VPM AREA 3,1,2
  10. 10. THALAMIC LESIONSC/L loss of all sensationsTHALAMIC SYNDROME:-Lacunar infarction1. c/l sensory loss2. Thalamic/ athetoid hand3. Intention tremor4. Choreoathetosis
  11. 11. 5. Thalamic over-reactioneg; DEJERINE ROUSSY SYNDROME- agonizing pain in the affected areaRx: frontal lobotomy6. Amelognosis7. Thalamic phantom limb8.Mild hemiparesis
  12. 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. 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. 14. LAT MED
  15. 15. Thalamic lesion Cortical lesionpain + _Tingling nnumbness + _Perception ofsensation _ +Loss ofdiscrimination _ +

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