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The Senses

Explore the intricate anatomy of the human senses, focusing on the eye, ear, nose, and tongue. Understand how the cornea protects the eye, the role of the iris and pupil in regulating light, and how the lens focuses images onto the retina. Learn about the ear's structure, including the pinna, eardrum, and cochlea, which amplify sound and transmit impulses to the brain. Delve into the processes of smell and taste, as well as the receptors for touch, temperature, and pain. Engage with diagrams and quizzes to reinforce your knowledge.

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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. Read the color of the text Read the color of the text

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

  6. 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) Hair cells in the cochlea bend 5) Impulse transmitted through the auditory nerve and to the brain

  7. 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

  8. 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

  9. Kobe Kuiz • Name the 5 senses. • Label the diagram of the eye. • Which eye part: • Protects the outer eye? • Contains rod and 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?

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