Comparative Test 3 (Set 9)

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mc166589
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115010
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Comparative Test 3 (Set 9)
Updated:
2011-11-06 20:44:43
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Comparative anatomy
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Comparative anatomy lecture test number three.
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  1. ________ are paired, reflected light is "imaged" on photosensitive epithelium (retina).
    Lateral Eyes
  2. _______ are single, light stimulates neuroendocrine reflex.
    Median eye
  3. The receptor site for lateral eyes is the ________. It is located at the rear of the fluid filled ______________.
    • Retina
    • Vitreous chamber
  4. Lateral eyes arise from embryonic forebrain as _____, which are attached to the brain by _____.
    • Optic cups
    • Optic stalks
  5. The retina contains _____ which are for light perception and _____ which are for color perception. These are called _____ cells.
    • Rods
    • Cones
    • Photoreceptors/ neurosensory
  6. What is an optic disk?
    It is the point where optic nerve leaves retina, no rods or cones present.
  7. What is the macula retina?
    It is the area behind the pupil of greatest visual acuity.
  8. When does the macula retina contain rods?
    If the animal is nocturnal.
  9. When does the macula retina contain cones?
    If the animal is diurnal.
  10. What is the fovea and what animals is it found?
    The fovea is the center of the macula with the greatest visual acuity. It is found in birds, lizards, and some mammals.
  11. What is the pigment layer?
    It is a small layer within the retina, it is usually a nonreflective black pigment which prevents random reflections of light within the eye.
  12. Rods and cones extend into the _____.
    Pigment layer
  13. _____ occur on the rods and cones, and these are chemically altered in the presence of light.
    Visual pigments
  14. In most vertebrates ____ is the pigment that is present in the rods.
    Rods
  15. Rhodopsin cannot be used to differentiate color because of what?
    It absorbs light from the entire spectrum.
  16. Cones contain pigments called _____ .
    Iodpsins
  17. Why is iodopsins responsible for color vision?
    Because they contain more restricted bands of absorption.
  18. What are the two layers that surround the eye?
    • Choroid coat
    • Sclerotic coat
  19. What is the choroid coat and where is it located?
    It forms iris diaphragm which dilates of constricts in response to light intensity. It is perforated by the pupil.
  20. What is the sclerotic coat and where is it located?
    It forms the white of the eye. It is transparent in the front of iris and pupil, forming the cornea. It may be hardened with carilage or bone.
  21. _____ are light receptors in the top of heads of various animals.
    Median eyes
  22. In what animals can median eyes be found?
    Lampreys, primitive teleosts, anuran larvae, and some adult anurans, sphenodons, and some other lizards.
  23. _____ is an evagination of the roof of the diecephalon of the brain.
    Median eyes
  24. What is the parietal eye?
    It lies in the parietal foramen under a single translucent epidermal scale.

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