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The Senses

The Senses. Eye Anatomy. Cornea Protective layer of the eye Iris Colored part of the eye Contains muscles to open & close the pupil Pupil Size adjusts with light Small: more light Large: less light Lens Focuses light onto the retina Retina Back of the eye Contains rods & cones.

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The Senses

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  1. The Senses

  2. Eye Anatomy • Cornea • Protective layer of the eye • Iris • Colored part of the eye • Contains muscles to open & close the pupil • Pupil • Size adjusts with light • Small: more light • Large: less light • Lens • Focuses light onto the retina • Retina • Back of the eye • Contains rods & cones Cow Eye Dissection Video

  3. Vision Process #3 • 1) Light passes through pupil • 2) Lens focuses light onto retina • 3) Photoreceptors of the retina create impulses • Impulse travels up optic nerve to brain #2 #1

  4. Ear Anatomy • Pinna • Outer ear • Eardrum • Amplifies sound by 3 bones: malleus, incus, stapes • Cochlea • Contains mechanoreceptors (measures pressure)

  5. Sound 1) Sound waves (vibration of the air) enters the ear canal 2) Eardrum & the small bones vibrate 3) Fluid in the cochlea vibrates 4) Hair cells in the cochlea bend 5) Impulse transmitted through the auditory nerve and to the brain Transmission

  6. Nose Scent chemicals dissolve in mucus Impulse travels from olfactory nerve to brain Tongue Chemicals dissolve in saliva Chemoreceptors in taste buds creates impulse Smell & Taste

  7. Touch, Temperature, Pain • Mechanoreceptors in skin sense pressure • Upper layer: gentle touches • Lower layer: heavy pressure • Thermoreceptors & Pain receptors detect temps and chemicals released by damaged cells • Impulses sent to brain

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