Eye structure



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LABORATORY EXERCISE 31

EYE STRUCTURE

Figure Labels

FIG. 31.1

1. Lacrimal gland 3. Lacrimal sac

2. Canaliculi (superior and inferior) 4. Nasolacrimal duct

FIG. 31.2

1. Superior oblique 4. Lateral rectus

2. Superior rectus 5. Inferior rectus

3. Medial rectus 6. Inferior oblique



FIG. 31.3

1. Pupil 9. Retina

2. Iris 10. Choroid coat

3. Ciliary body 11. Sclera

4. Suspensory ligaments 12. Vitreous humor

5. Lens 13. Fovea centralis

6. Cornea 14. Optic nerve

7. Aqueous humor 15. Optic disc



8. Anterior 16. Posterior

Critical Thinking Application Answer

The delicate retina is only located next to the choroid coat by the pressure maintained by the vitreous humor. Any alteration of this pressure could allow the retina to detach as was easily observed during the dissection. No connective tissue was observed between the inner and middle layers of the eye.



Laboratory Report Answers

PART A

1. b 8. f

2. j 9. a

3. e 10. i

4. d 11. k

5. g 12. c

6. l 13. Cornea, aqueous humor, pupil of iris, lens, vitreous humor,

7. h retina

14. Answers will vary.

PART B

1. The outer layer (sclera) is toughest. 5. The dark pigment absorbs excess light and keeps the eye dark

2. Dense (fibrous) connective tissue is responsible. dark inside.

3. The pupil of the dissected eye was probably 6. The lens is biconvex and transparent (a preserved lens becomes

elliptical in shape, and the human pupil is round. cloudy).

4. Aqueous humor occurs between the cornea and 7. The vitreous humor is a transparent, jellylike fluid.



the lens.


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