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The Senses

The Senses . VISION:. Sclera Cornea Choroid Ciliary body Iris Retina. VISION CONT’D:. THREE LAYERS: Outer layer Sclera- white part; maintains shape; attachment Cornea- transparent; part light enters Middle layer Choroid- blood vessels Iris- gives eye its color Pupil light enters

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The Senses

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  1. The Senses

  2. VISION: • Sclera • Cornea • Choroid • Ciliary body • Iris • Retina

  3. VISION CONT’D: • THREE LAYERS: • Outer layer • Sclera- white part; maintains shape; attachment • Cornea- transparent; part light enters • Middle layer • Choroid- blood vessels • Iris- gives eye its color • Pupil light enters • Inner layer • Retina- photoreceptors; light energy to impulses to CNS

  4. HEARING: • Vibrations in the air around us • Deep, low-pitched sounds = low frequency (100-500 vibrations per second) • High-pitched sounds = high frequecy (1000-5000 vibrations per second)

  5. EAR ANATOMY: • External ear- collect and funnel sounds • Auditory Canal- tiny hairs and wax • Middle ear-sound waves transmitted • Malleus (hammer) • Incus (anvil) • Stapes (stirrup) • Cochlea- begins inner ear carries impulses to the brain by acoustic nerves

  6. HEARING:

  7. HEARING CONT’D: • BALANCE: • 3 tiny canals located above cochlea • Structures that help maintain our • Balance • movement

  8. SMELLING: • NOSE:

  9. SMELLING CONT’D: • Chemoreceptors • Located in upper region of the nasal cavity • Contain cilia extend into air passageways of nose • Chemicals stimulate them, causing impulses to be sent to the brain *Mystery!

  10. TASTE: • Lips • Roof of mouth • Throat

  11. TOUCH:

  12. TOUCH CONT’D: • 2 types respond to heat and cold • Scattered directly below the skin • ¾ warm to every cold • 2 types respond to touch • Fingers, toes, and lips are most sensitive • 1 type to pain • Located throughout skin • Prickling (fast) pain; Burning/aching (slow) pain

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