special sense i – vision. visual pathway lesion in optic nerve leads to loss of vision on the same...
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Special sense
I – VISION
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Visual pathway
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• Lesion in optic nerve leads to loss of vision on the same side of lesion
• optic tract: *Left optic tract is responsible for vision in nasal
half of left visual field and temporal half of right visual field
*right optic tract is responsible for vision in nasal half of right visual field and temporal half of left visual field
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II- HEARING
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Auditory pathway
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• External ear: collect sounds & direct it to tympanic membrane
• Middle ear: sounds vibrate the tympanic membrane then transmitted to auditory ossicles
• Types of conduction: 1- ossicular conduction 2- air conduction3- bone conduction• Austachian tube: responsible for equalizing
pressure on either side of tympanic membrane
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III- TASTE
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• Taste buds situation
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Taste pathway
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• Taste sensation
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IV- SMELL
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Smell pathway
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Vision Hearing Smell Taste
Receptor Rods & cons Hair cell in organ of corti
Olfactory receptor Taste buds
Site In retina Inner ear Nose Tongue
Nerve Optic nerve Auditory nerve“vestibulocochlear “
Olfactory nerve *Anterior 2/3 of tongue: fibers of facial nerve*Posteior 1/3 of tongue: glossopharyngeal nerve*Vagal fibers from other regions
Relay in thalamus
Relay in thalamus
Relay Not relay in thalamus
Relay
Cerebral cortex
Occipital role Temporal lobe Olfactory cortex includes structures which form apart of limbic system
Parietal lobe