Exam 3 Remington- Embryology Flashcards Preview

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Flashcards in Exam 3 Remington- Embryology Deck (170)
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1

What are the reasons for studying the development of the eye?

Adult anatomy explained, histology of ocular tissue, congenital abnormalities explained, congenital anomalies are more prevalent since more premature and high risk babies surviving

2

What are the steps after fertilization?

Fertilization -> Morula (solid mass) -> Blastula -> Inner cell mass (implanted in uterine wall about 10 day) -> Embryonic plate

3

Proliferation

Increase in number of cells

4

Migration

Move to new location

5

Differentiation

Process by which a cell acquires specific functional and structural characteristics

6

Induction

The influence a certain region of tissue or developing structure has on the development of another structure

7

When is the embryonic plate formed?

Day 15

8

Ectoderm

CNS, epidermis of skin, exocrine glands, inner ear, hair and nails

9

Mesoderm

CT, skeletal system, muscle, dermis of skin, circulatory system

10

Endoderm

lining of alimentary and respiratory tracts

11

Neural plate

The ectodermal part of embryonic plate that will become CNS

12

When does thickening occur in ectoderm?

Day 18

13

When is the neural tube formed?

Day 22

14

The neural ectoderm forms the ____

Tube

15

The surface ectoderm covers the ______

Organism

16

Neural crest cells separate from ____ ____

Crest areas

17

What is formed from the neural ectoderm?

RPE, neural retina, optic nerve fibers, neuroglia, epithelium of ciliary body, epithelium of iris, iris sphincter, dilator muscles

18

What is formed from the surface ectoderm?

Lens, corneal epithelium, conjunctival epithelium, epithelium of eyelids, cilia, Meibomian glands, glands of Zeis and Moll, epithelium lining nasolacrimal system

19

What is formed from the neural crest cells?

Corneal stroma (which gives rise to Bowman's layer), corneal endothelium (which gives rise to Descemet's), most of sclera, trabecular structures, uveal pigment cells, uveal CT, ciliary muscle, meninges of optic nerve, vascular pericytes

20

Where is the mesoderm located?

Between ectoderm and endoderm

21

Mesenchyme

Includes both neural crest and mesoderm

22

The neural tube will form _____

CNS

23

When do optic pits become optic vesicles and out-pouches from diencephalon form?

Day 25

24

Optic stalk

Region joining optic vesicle to neural tube constricts

25

Optic cup

Inferior region of the vesicle and stalk begins to invaginate and forms a cleft

26

Optic fissure

Also called fetal fissure or embryonic fissure

27

Coloboma

Incomplete closure of fissure, will result in incomplete formation of certain structures and/or layers

28

What is a thickening in the surface ectoderm?

Lens vesicle

29

What forms the lens plate or placode?

Lens vesicle

30

What gene may be one of the factors that extablishes the lens component of surface ectoderm?

Pax-6