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The Senses

The Senses. Cornea Outer protective layer Iris Colored part of the eye Contains muscles to open & close the pupil Pupil Size adjusts with light Shrinks in bright light Opens in dim light Lens Focuses light onto the retina Vitreous Gel Fluid filled sac provides nutrients to eye Retina

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The Senses

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  1. The Senses

  2. Cornea • Outer protective layer • Iris • Colored part of the eye • Contains muscles to open & close the pupil • Pupil • Size adjusts with light • Shrinks in bright light • Opens in dim light • Lens • Focuses light onto the retina • Vitreous Gel • Fluid filled sac provides nutrients to eye • Retina • Back of the eye • Contains rods & cones • Optic Nerve • Sends impulses to brain Eye Anatomy Optic nerve cornea lens vitreous pupil iris retina cow eye dissection video

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

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

  7. SoundTransmission 1) Sound waves (vibration of the air) enters the ear canal 2) Eardrum & the small bones vibrate 3) Fluid in the cochlea vibrates 4) Cilia of “hair cells” in the cochlea bend (impulse generated) 5) Impulse transmitted through the auditory nerve and to the brain

  8. 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

  9. 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

  10. Kobe Kuiz • Name the 5 senses. • Label the diagram of the eye. • Which eye part: • Protects the outer eye? • Contains rod & cone cells? • Focuses light? • Name the three bones behind the ear drum? • Name the bone of the ear that has hair cells. • Which sense is: • related to the optic nerve? • related to the olfactory nerve? • related to the auditory nerve? • Which nerves detect: • temperature changes? • Pressure? • Chemicals?

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