MCB nervous practical set 4

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Author:
jdbreen2
ID:
250486
Filename:
MCB nervous practical set 4
Updated:
2013-12-03 14:38:04
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nervous
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Set #4 (start: the eye)
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  1. Structures of the Eye
  2. Cornea
    clear outer covering of the anterior portion of the eye;physically continuous with the sclera; important for refracting light rays entering eye

  3. Pupil
    • opening in the iris which regulates amount of light entering retina; diameter changes depending on contraction of pupillary eye muscles
  4. iris
    • pigmented layer containing melanocytes(eye color)  
  5. Choroid
    • (vascular layer); highly vascularized layer with extensive capillary network
  6. Retina
    • (neural layer); innermost layer containing the eyes 2 types of photoreceptors; rods for light intensity and cones for color vision
  7. Sclera
    • (fibrous layer); thickest layer comprised of dense fibrous connective tissues; whites of
    • the eye
  8. Fovea centralis
    • part of the neural layer of the eye; contains highest concentration of cones(areas of visual activity)
  9. Lens
    • transparent structure in the anterior eyes whose function is to focus visual images onto the fovea of the retina
  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 
  11. Structures of the Ear
  12. Auricle (pinna)
    • localize sounds and directs sounds into the external acoustic meatus
  13. external acoustic meatus (auditory canal)
    • passageway that transmits sounds to the tympanic membrane (eardrum)
  14. tympanic membrane (eardrum)
    • vibrates in response to sound waves which it transmits to the structures of the middle ear
  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
  16. auditory ossicles
    • 3 ossicles (incus, malleus, stapes) receive vibrations from tympanic membrane which they amplify and transmit to the inner ear(cochlea) 
  17. vestibule
    • transmit info to the brain about gravity, linear acceleration and head orientation in space
  18. semicircular canal
    • transmit info to the brain about gravity, linear acceleration and head orientation in space

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