Frontal Lobe
Primary motor cortex(Ms1)- Area 4, located in precentral gyrus( front of central sulcus)
Premotor area- Area 6 and 8
Prefrontal cortex-9,10,11
Frontal eye field- Common area supplied by premotor area and prefrontal cortex.
Supplementary motor area(MsII)- On medial surface.
Lesions of frontal lobe
MsI- Contralateral hemiplegia
Premotor area-Difficulty to perform skilled movements
MsII-B/L flexor hypotonia
Prefrontal cortex-Also called silent area of brain.Concerned with Intelligence,memory,absract thinking,behaviour,pleasure and displeasure.Involved in depressed fracture of frontal bone.
Frontal eye field-Deviation of eyes to the side of lesion and inability to move eyes to the opposite side(Loss of conjugate eye movements)
Parietal lobe
Primary sensory area(SmI)- Areas 3,1,2
Sensory association area-5,7
Sensory speech area-39,40
Secondary sensorya Area(SmII)-Upperlip of posterior ramus of parietal lobe.
Lesions of parietal lobe
SmI-Loss of appreciation of all sensations from opposite half of body.
SmII-Ablation may relieve intractable pain.
Sensory association area-Tactile agnosia/astereognosis
Wernicke’s area-22,39,40-Sensory aphasia/receptive aphasia.Inability to understand written word(Word blind)
Temporal lobe
Primary auditory area-41,42
Secondary auditory area(Auditary association area)-22
Lesions
Dejavu-due to temporal lobe lesion
b/l lesion-total deafness.
secondary association area-Inability to intepret meanings of words heard(Word deafness)
Psychic Cortex-Anterior part of temporal lobe.In lesions visual and auditory hallucinations develop.Dejavu.Removal of this part leads to deletion of past experiences from memory.
Occipital lobe
Primary visual area-Striate area-area 17
Secondary visual areas/psychovisual areas
- Peristriate area-area 18
- Parastriate area-area 19
Lesions
Primary visual area-Loss of vision in opposite visual field(Crossed homonemous hemianopia)
Secondary visual area-Inabiliy to recognize objects in opposite visual field.
Other areas
Area -44 -Area for taste
Area 28-Olfactory area
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