16.3 - Anatomy of Vision

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Across
  1. 2. any of three layers of the wall of the eye
  2. 3. anterior convex transparent "window"; no blood vessels; refracts light; from deep to superficial: simple squamous, collagen, stratified squamous
  3. 5. ___ reflex; alters pupil size in response to light; controlled by ANS
  4. 10. the sense of sight
  5. 11. ___ pupillae; smooth muscle that constricts the pupil
  6. 12. ora ___; the jagged edge; boundry between photosensitive and other parts of retina; tubelike structures
  7. 13. ___layer of the retina; houses photoreceptors and associated neurons; receives light and converts it to nerve signals
  8. 15. a type of cell found in the outermost layer of the neural layer of the retina; features rods and cones
  9. 17. what gives eyes color; most anterior region of uvea; contains smooth muscles, melanocytes, vessels, neural structures, and the pupil
  10. 18. structure formed by cells that have lost organelles and been filled with crystallin protein; enclosed by dense, fibrous elastic capsule and controlled by ciliary muscle
  11. 20. ___ cells; a retinal interneuron that regulates signals between bipolar and ganglion layers
  12. 23. ___ humor; transparent, gelatinous fluid first produced in embryonic development; V-Humor
  13. 24. an opening in the center of the iris connecting two chambers; has two special muscles that react to ANS
  14. 27. ___ structures; structures that support the eye and vision, but are not part of the eye; eyebrows, eyelids, eyelashes, conjunctiva, lacrimal glands, and the six extrinsic eye muscles
  15. 30. ___ cells; innermost layer of neural layer; where axons gather at optic disc
  16. 31. the neural tunic; most inner layer of eye wall
  17. 32. posterior region of the uvea; capillaries nourish retina; melanocytes make melanin to absorb extraneous light
  18. 33. also called "uvea"; the middle layer of the cell wall, with three regions
Down
  1. 1. the "whites of the eyes"; dense, irregular CT that protects internal elements and provides attachment for extrinsic muscles
  2. 4. ___humor; transparent, watery fluid continuously produced by ciliary processes; A-Humor
  3. 6. ___ cells; dendrites that receive synaptic input from photoreceptor layer
  4. 7. ___ cells; a retinal interneuron that regulates signals between photoreceptor and bipolar layers
  5. 8. ___ pupillae; smooth muscle that opens the pupil
  6. 9. corneal-scleral junction
  7. 14. ___ disc; the blind spot; location where optical axons converge to send signals
  8. 16. either of two internal compartments of the eye
  9. 19. how A-humor works; plasma filtered by capillaries into posterior chamber, then circulates through pupil to anterior chamber and drains from slceral venous sinus
  10. 21. ___ cavity; contains circulated A-Humor to nourish and oxygenate lens and inner cornea; has two chambers separated by iris
  11. 22. the main sensory organ for vision; almost spherical, contains receptors and support tissue
  12. 25. ___ layer of the retina; internal to choroid; provides vitamin A for photoreceptors and absorbs stray light
  13. 26. ___ cavity; contains permanent V-Humor to maintain eye shape and keep retina flush against the back of the eye
  14. 28. an eye condition caused by A-Humor drainage failure
  15. 29. the tough, external layer of the eye wall
  16. 32. ___ body; location of smooth muscles and capillary processes for A-humor; anterior to choroid