The senses
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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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Vision
VISION:

  • Sclera

  • Cornea

  • Choroid

  • Ciliary body

  • Iris

  • Retina


Vision cont d
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


Hearing
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)


Ear anatomy
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



Hearing cont d
HEARING CONT’D:

  • BALANCE:

    • 3 tiny canals located above cochlea

    • Structures that help maintain our

      • Balance

      • movement


Smelling
SMELLING:

  • NOSE:


Smelling cont d
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!


Taste
TASTE:

  • Lips

  • Roof of mouth

  • Throat



Touch cont d
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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