Term
| 205. Which structure (a thickening of ectoderm) gives rise to the CNS including ocular structure |
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Definition
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Term
a. neural tube
b. neural ectoderm |
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Definition
| 206. When the neural folds fuse, what do we call the tube that is formed? What is this tube lined with |
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Term
| 207. What do we call mesoderm combined with neural crest |
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Definition
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Term
| 6. Once the neural tube is closed, optic pits form what structures? |
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Definition
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Term
| 7. As the neural tube constricts, the optic vesicle forms what structure? |
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Definition
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Term
| 8. What do we call the structure that is formed as the optic vesicle and optic stalk buckle inward? |
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Definition
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Term
| 9. During formation of the optic fissure, which structure is placed in the position of the future retina? |
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Definition
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Term
| 10. What do we call an incomplete closure of the optic fissure? |
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Definition
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Term
| 11. As the optic fissure closes. |
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Definition
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Term
| a. What three structures are destined to become the outer layer? |
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Definition
i. RPE
ii. Outer pigment epithelium of the ciliary body
iii. Anterior iris epithelium |
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Term
| What three structures are destined to become the inner layer? |
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Definition
i. Neural retina
ii. Inner non-pigmented epithelium of the ciliary body
iii. Posterior iris epithelium |
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Term
12. Define “Induction”.
The formation and growth of specific structures when influenced (induced) by other structures |
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Definition
| The formation and growth of specific structures when influenced (induced) by other structures. |
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Term
| 13. During lens development, the surface ectoderm begins to thicken, forming what structure? |
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Definition
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Term
| 14. Which structure is formed from the lens pit? |
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Definition
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Term
| 15. Nuclei of the lens fibers move anterior forming a line called what? |
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Definition
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Term
| 16. What do we call lens fibers that are formed throughout life? |
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Definition
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Term
| 18. What do we call the layer of the developing retina that separates the inner and outer neuroblastic layers at 2 ½ months? |
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Definition
| (Transient layer of Chievitz) |
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Term
| List the structures that will develop from the inner layer. |
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Definition
i. Ganglion cells
ii. Amacrine cells
iii. Müller cells |
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Term
| List the structures that will develop from the outer layer. |
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Definition
i. Bipolar cells
ii. Horizontal cells
iii. Photoreceptor cells |
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Term
| In the developing retina, when are the multiple retinal layers almost complete? |
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Definition
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Term
| 20. At what chronological stage of development is the cornea in the adult form? |
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Definition
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Term
| 21. Why do the upper and lower lids fuse together during the 2nd month of development? |
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Definition
| Fusion of the eyelids prevents amniotic fluid from “keratinizing” the developing cornea and conjunctiva. |
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Term
| 22. List 5 reasons to use topical anesthetics. |
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Definition
a.Easier assessment of corneal or conjunctival disorders
b. Diagnostic tests
c. Foreign body removal
d. Enhance adaptation to rigid gas permeable contact lenses
e. Trauma repair |
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