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Special sense I – VISION Visual pathway • 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 II- HEARING Auditory pathway • 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 conduction 3- bone conduction • Austachian tube: responsible for equalizing pressure on either side of tympanic membrane III- TASTE • Taste buds situation Taste pathway • Taste sensation IV- SMELL Smell pathway 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 Parietal lobe
