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Cortical areas of brain and their lesions
Cortical areas of brain and their lesions
Cortical areas of brain and their lesions
Cortical areas of brain and their lesions
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Cortical areas of brain and their lesions

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  • 1. CORTICAL AREAS OF BRAIN AREA NAME LESIONS NO. LOCATION Broca’s motor area of speech Expressive aphasia 44,45 Inferior frontal gyrus Wernicke’s sensory area of speech Receptive Aphasia Superior&Middle temporal gyrus Frontal Eye field for voluntary eye movements& accommodation DESTRUCTIVE LESION:Deviation of eyes to the side of lesion IRRITATIVE LESION:Periodic deviation of eyes to opposite side 6,7,8 Centre of middle temporal gyrus Gustatory Area for taste 3,2,1 Inferior part of postcentral gyrus Olfactory Area Uncus Primary Visual area #Crossed Homonymous hemianopia ABOVE THE CALCARINE FISSURE:Inferior quadrantic hemianopia BELOW THE CALCARINE FISSURE: Superior quadrantic hemianopia 17 Medial surface of occipital lobe,Lips of posterior part of calcarine fissure
  • 2. Secondary visual area #Loss of ability to recognize objects in the opposite field of vision because the part of cortex that stores past visual experiences is lost. 18,19 Primary Motor area #Contralateral paralysis of extremities #IRRITATION:Jacksonian epileptic seizures 4 Precentral gyrus Secondary Motor area #Difficulty in skilled movements #Muscle strength unaffected 6 Primary Somesthetic area #Contralateral sensory disturbances #PTT return but not the precision&degree of warmth #Muscle tone lost 3,2,1 Postcentral gyrus Secondary somesthetic area No recognizable sensory defect Somesthetic Association area Astereognosis(Inability to combine touch,pressure&proprio ceptive impulses to appreciate size,texture&form when
  • 3. eyes are kept closed) Primary Auditory area Unilateral destruction Bilateral destruction #Bilateral hearing loss greater in opposite ear #Complete deafness 41,42 Floor of lateral sulcus,Superior temporal gyrus Secondary auditory area Word deafness,Acoustic verbal agnosia,Inability to interpret sounds Posterior to primary auditory area Auditory association area 22 Dominant Angular Gyrus Agraphia(Inability to write) Alexia(Inability to read) Posterior part of sup.parietal lobule PhirMohabbat [.mp3 Neglect syndrome(Inability to recognize the opposite side of body) Prefrontal cortex #Euphoria(Sensation of well-being) #Inacceptance of social behavior #Carelessness of dress
  • 4. or appearence Insula Difficulty in pronouncing phonemes&they often produce sounds that are close to target but not exactly correct Reference: Snell’s Neuroanatomy

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