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Special sense I – VISION

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Page 1: 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

Special sense

I – VISION

Page 2: 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

Visual pathway

Page 3: 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
Page 4: 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

• 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

Page 5: 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

II- HEARING

Page 6: 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

Auditory pathway

Page 7: 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
Page 8: 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

• 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

Page 9: 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
Page 10: 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
Page 11: 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
Page 12: 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

III- TASTE

Page 13: 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

• Taste buds situation

Page 14: 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

Taste pathway

Page 15: 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
Page 16: 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

• Taste sensation

Page 17: 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
Page 18: 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

IV- SMELL

Page 19: 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

Smell pathway

Page 20: 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

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


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