Ch18_SpecialSenses

Ch18_SpecialSenses - Special senses I Gustatory &...

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Special senses I Gustatory & Auditory senses Special senses
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Receptor > afferent neuron • Receptors stimulate sensory neurons • Sensory neurons sends signal to the CNS
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• Special sense receptors-located inside of special sense organs • Olfaction-nasal cavity • Gustation-tongue • Equilibrium & auditory-ears • Vision-eyes
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Vision • 70% of ALL body receptors are found in the eye • Use Photoreceptors – cones- detect color (3 types) visual acuity – rods- detect light / dark Three layers: • Fibrous tunic • Vascular tunic • Nervous tunic • Fibrous Tunic Sclera - “the whites of their eyes” Cornea - focus light (no blood vessels)
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Vascular Tunic Choroid -contains blood vessels Ciliary Body - muscle that suspends / moves lens Iris - muscular diaphragm used to adjust amount of light entering eye (pigmented) Lens - clear / flexible Nervous Tunic • -made of nervous tissue • -contains photoreceptors (light receptors) Fovea - concentration of cones at back of eye Optic Disc - “blind spot” where optic nerve exits: no photoreceptors
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Fig 18.21
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Fig 18.22
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Fig 18.22
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Photoreceptors in retina Fig 18.23 Rods & Cones • Cones: 6 mil in posterior region of retina • Three colors-red, blue, green • High acuity • Function in bright light • Rods-125 mil at periphery of retina • Black & white vision • Low acuity • Function at low light levels
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Photoreceptors Fig 18.23
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thalamus Occipital lobe thalamus Fig 18.26
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Vision tracing Light rays Cornea Anterior chamber Pupil Posterior chamber Lens Vitreous body Rods & cones Bipolar cells Ganglion cells Optic nerve (cranial nerve 2) Optic chiasm •T h a l a m u s Cerebral cortex in occipital lobe
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Photoreceptors FYI
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FYI thalamus Occipital lobe thalamus
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Auditory (hearing) • Three regions of the ear used for auditory sense: • External, middle, & internal ear
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Ch18_SpecialSenses - Special senses I Gustatory &...

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