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Cortical areas of brain and their lesions

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  • 1. CORTICAL AREAS OF BRAINAREA NAME LESIONS NO. LOCATIONBroca’s motor area Expressive aphasia 44,45 Inferior frontal gyrusof speechWernicke’s sensory Receptive Aphasia Superior&Middlearea of speech temporal gyrusFrontal Eye field DESTRUCTIVE 6,7,8 Centre of middlefor voluntary eye LESION:Deviation of temporal gyrusmovements& eyes to the side ofaccommodation lesion IRRITATIVE LESION:Periodic deviation of eyes to opposite sideGustatory Area for 3,2,1 Inferior part oftaste postcentral gyrusOlfactory Area UncusPrimary Visual area #Crossed Homonymous 17 Medial surface of hemianopia occipital lobe,Lips of ABOVE THE CALCARINE posterior part of FISSURE:Inferior calcarine fissure quadrantic hemianopia BELOW THE CALCARINE FISSURE: Superior quadrantic hemianopia
  • 2. Secondary visual #Loss of ability to 18,19area recognize objects in the opposite field of vision because the part of cortex that stores past visual experiences is lost.Primary Motor #Contralateral paralysis 4 Precentral gyrusarea of extremities #IRRITATION:Jacksonian epileptic seizuresSecondary Motor #Difficulty in skilled 6area movements #Muscle strength unaffectedPrimary #Contralateral sensory 3,2,1 Postcentral gyrusSomesthetic area disturbances #PTT return but not the precision&degree of warmth #Muscle tone lostSecondary No recognizable sensorysomesthetic defectareaSomesthetic Astereognosis(InabilityAssociation to combinearea touch,pressure&proprio ceptive impulses to appreciate size,texture&form when
  • 3. eyes are kept closed)Primary Unilateral #Bilateral hearing loss 41,42 Floor of lateralAuditory destruction greater in opposite ear sulcus,Superiorarea temporal gyrus Bilateral #Complete deafness destructionSecondary Word deafness,Acoustic Posterior toauditory verbal agnosia,Inability primaryarea to interpret sounds auditory areaAuditory 22associationareaDominant Agraphia(Inability toAngular write)Gyrus Alexia(Inability to read)Posterior Neglectpart of Phir Mohabbat [.mp3 syndrome(Inability tosup.parietal recognize the oppositelobule side of body)Prefrontal #Euphoria(Sensation ofcortex well-being) #Inacceptance of social behavior #Carelessness of dress
  • 4. or appearenceInsula Difficulty in pronouncing phonemes&they often produce sounds that are close to target but not exactly correctReference: Snell’s Neuroanatomy