Review Sheet 24- Special Senses Vision

Review Sheet 24- Special Senses Vision - REVIEW SHEET NAME...

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Unformatted text preview: REVIEW SHEET NAME EXERCISE LAB TIM E/DATE Special Senses: Vision Anatomy of the Eye 1. Name five accessory eye structures that contribute to the fonnation of tears andfor aid in lubrication of the eyeball, and then name the major secretory product of each. Indicate which has antibacterial properties by circling the correct secretory product. 2. The eyeball is wrapped in adipose tissue within the orbit. What is the function of the adipose tissue? 3. Why does one often have to blow one’s nose after crying? Hammer-Ema! dam. 4. Identify the extrinsic eye muscle predominantly responsible for each action described below. 1. turns tlte eye laterally 2. turns tlte eye medially b3 turns tlte eye up and laterally 4. turns tlte eye inferiorly 5. turns tlte eye superiorly 6. turns tlte eye down and laterally 5. What is a sty‘? Conjunctivitis? 161 6. Correctly identify each lettered structure in the diagram by writing the letter next to its natne in the numbered list. a b _l. I; Blowup of I photosensitive . _ ‘\\reti na . ‘-\\ x .\ Pigmented epithelium 21. 2. 3-" h — 10. ll. l2. l3. 14. 16. 1?. 18. 19. 20. anterior chamber anterior segment bipolar neurons choroid ciliary body and processes ciliary muscle comea dura mater fovea centralis ganglion cells iris lens optic disc optic nerve photoreceptors posterior chamber retina sclera scleral venous sinus suspensory ligaments (ciliary zonule) posterior segment Notice the arrows drawn close to the left. side of the iris in the diagram above. What do they indicate? 7. The iris is composed primarin of two smooth muscle layers, one arranged radially and the other circularly. Which of these dilates the pupil? 8. You would expect the pupil to be dilated in which of the following circumstances? Circle the correct response(s}. a. in bright light b. in dim light c. focusing for near vision d. 9. The intrinsic eye muscles are controlled by {circle the correct response): autonomic nervous system somatic nervous system 162 Review Sheet 24 observing distant objects 10. Match the key responses with the descriptive statements that follow. Key: a. aqueous humor e. cornea j. retina b. choroid f. fovea centralis k. sclera c. ciliary body g. iris l. scleral venous sinus d. ciliary processes of h. lens m. vitreous humor the ciliary body i. optic disc l. fluid filling the anterior segment of the eye 2. the "white" ofthe eye 3. part of the retina that lacks photoreceptors 4. modification of the choroid that controls the shape of the crystalline lens and contains the ciliary muscle 5. drains the aqueous humor from the eye 6. layer containing the rods and cones 7. substance occupying the posterior segment of the eyeball 8. forms the bulk of the heavily pigmented vascular layer 9. smooth muscle structures [2) 10. area of critical focusing and discriminatory vision 11. form (by filtration} the aqueous humor l2. light-bending media ofthe eye (4) 13. anterior continuation of the sclera—your “window on the world" 14. composed of tough, white, opaque. fibrous connective tissue Microscopic Anatomy of the Retina ll. 12. 13. The two major layers of the retina are the epithelial and neural layers. In the neural layer, the neuron populations are arranged as follows from the pigmented epithelial layer to the vitreous humor. (Circle the proper response.) bipolar cells, ganglion cells, photoreceptors photoreceptors, ganglion cells. bipolar cells ganglion cells, bipolar cells, photoreceptors photoreceptors, bipolar cells. ganglion cells The axons of the cells form the optic nerve, which exits from the eyeball. Complete the following statements by writing either rods or cones on each blank. The dim light receptors are the . Only are found in the fovea centralis, whereas mostly are found in the periphery of the retina. are the photoreceptors that operate best in bright light and allow for color vision. Review Sheet 24 163 Dissection of the Cow (Sheep) Eye 14. What modification of the choroid that is not present in humans is found in the cow eye? What is its function“.- 15. What does the retina look like? At what point is it attached to the posterior aspect of the eyeball? Visual Pathways to the Brain 16. The visual pathway to the occipital lobe of the brain consists most simply of a chain of five cells. Beginning with the pho- toreceptor cell of the retina. name them and note their location in the pathway. l. 4. 2. 5. 3. 17. Visual field tests are done to reveal destruction along the visual pathway from the retina to the optic region of the brain. Note where the lesion is likely to be in the following cases. Normal vision in left eye visual field; absence of vision in right eye visual field: Normal vision in both eyes for right half ofthe visual field; absence of vision in both eyes for left half ofthe visual field: 18. How is the right optic tract anatomically different from the right optic nerve? Visual Tests and Experiments 19. Match the terms in column B with the descriptions in column A. Column A Column B 1. light bending a. accommodation 2. ability to focus for close (less than 20 feet) vision b. astigmatism 3. normal vision c. convergence 4. inability to focus well on close objects (farsightedness) d. emmetropia 5. nearsightedness e. hyperopia 6. blurred vision due to unequal curvatures of the lens or cornea f. myopia 't'. medial movement of the eyes during focusing on close objects g. refraction 164 Review Sheet 24 20. Complete the following statements: ln farsightedness, the light is focused l the retina. The 1. lens required to treat myopia is a 2 lens. The “near point" in— creases with age because the 3 ofthe lens decreases as we get 2_ older. A convex lens. like that of the eye, produces an image that is upside down and reversed from left to right. Such an image is 3_ calleda 4 image. 4. 21. Use terms from the key to complete the statements concerning near and distance vision. Key: a. contracted b. decreased c. increased (1. relaxed e. taut During distance vision, the ciliary muscle is . the suspensory ligament is , the convexity of the lens is . and light refraction is . During close vision, the ciliary muscle is , the suspensory ligament is , lens convexity is , and light refraction is 22. Explain why vision is lost when light hits the blind spot. 23. Using your Snellen eye test results, answer the following questions. Is your visual acuity normal, less than normal, or better than normal? Explain your answer. Explain why each eye is tested separately when using the Snellen eye chart. Explain 20,140 vision. Explain ZUHU vision. 24. Define astigmatism. How can it be corrected? 25. Define presbyopi'a. What. causes it? Review Sheet 24 165 26. 27. 28. 29. 30. 31. 32. 166 To which wavelengths of light do the three cone types of the retina respond maximally? s —, and How can you explain the fact that we see a great range of colors even though only three cone types exist? Explain the difference between binocular and panoramic vision. What is the advantage of binocular vision? What factor(s) are responsible for binocular vision? In the experiment on the convergence reflex, what happened to the position of the eyeballs as the object was moved closer to the subject’s eyes? What extrinsic eye muscles control the movement of the eyes during this reflex? What is the value of this reflex? In the experiment on the photopupillary reflex, what happened to the pupil of the eye exposed to light? What happened to the pupil of the nonilluminated eye? Explanation? Why is the ophthalmoscopic examination an important diagnostic too]? Many college students struggling through mountainous reading assignments are told that they need glasses for “eyestrain.” Why is it more of a strain on the extrinsic and intrinsic eye muscles to look at close objects than at far objects? Review Sheet 24 ...
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This note was uploaded on 07/20/2011 for the course BIO 201 taught by Professor Quintana during the Spring '10 term at TAMU Intl..

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Review Sheet 24- Special Senses Vision - REVIEW SHEET NAME...

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