Flashcards in Exam 3 Remington- Embryology Deck (170)
Loading flashcards...
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
