MCB nervous practical set 4

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  1. Structures of the Eye
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  2. Cornea
    clear outer covering of the anterior portion of the eye;physically continuous with the sclera; important for refracting light rays entering eye

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  3. Pupil
    • opening in the iris which regulates amount of light entering retina; diameter changes depending on contraction of pupillary eye muscles
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  4. iris
    • pigmented layer containing melanocytes(eye color)  
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  5. Choroid
    • (vascular layer); highly vascularized layer with extensive capillary network
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  6. Retina
    • (neural layer); innermost layer containing the eyes 2 types of photoreceptors; rods for light intensity and cones for color vision
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  7. Sclera
    • (fibrous layer); thickest layer comprised of dense fibrous connective tissues; whites of
    • the eye
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  8. Fovea centralis
    • part of the neural layer of the eye; contains highest concentration of cones(areas of visual activity)
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  9. Lens
    • transparent structure in the anterior eyes whose function is to focus visual images onto the fovea of the retina
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  10. Optic Nerve (CN II)
    • comprised of axons of ganglion cells that transmit info from the eye to the brain; area where these axons exit the eye (optic disc) produce a “blind spot” in our visual field 
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  11. Structures of the Ear
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  12. Auricle (pinna)
    • localize sounds and directs sounds into the external acoustic meatus
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  13. external acoustic meatus (auditory canal)
    • passageway that transmits sounds to the tympanic membrane (eardrum)
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  14. tympanic membrane (eardrum)
    • vibrates in response to sound waves which it transmits to the structures of the middle ear
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  15. cochlea
    • contains hair cells that take the mechanical sound vibrations relayed from the external and middle ear structures and converts them into nerve impulses which are relayed to the brain
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  16. auditory ossicles
    • 3 ossicles (incus, malleus, stapes) receive vibrations from tympanic membrane which they amplify and transmit to the inner ear(cochlea) 
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  17. vestibule
    • transmit info to the brain about gravity, linear acceleration and head orientation in space
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  18. semicircular canal
    • transmit info to the brain about gravity, linear acceleration and head orientation in space
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Card Set
MCB nervous practical set 4
Set #4 (start: the eye)
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