Flashcards in Exam 3 Remington- Embryology Deck (170)
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
What are the steps after fertilization?
Fertilization -> Morula (solid mass) -> Blastula -> Inner cell mass (implanted in uterine wall about 10 day) -> Embryonic plate
Increase in number of cells
Move to new location
Process by which a cell acquires specific functional and structural characteristics
The influence a certain region of tissue or developing structure has on the development of another structure
When is the embryonic plate formed?
CNS, epidermis of skin, exocrine glands, inner ear, hair and nails
CT, skeletal system, muscle, dermis of skin, circulatory system
lining of alimentary and respiratory tracts
The ectodermal part of embryonic plate that will become CNS
When does thickening occur in ectoderm?
When is the neural tube formed?
The neural ectoderm forms the ____
The surface ectoderm covers the ______
Neural crest cells separate from ____ ____
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
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
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
Where is the mesoderm located?
Between ectoderm and endoderm
Includes both neural crest and mesoderm
The neural tube will form _____
When do optic pits become optic vesicles and out-pouches from diencephalon form?
Region joining optic vesicle to neural tube constricts
Inferior region of the vesicle and stalk begins to invaginate and forms a cleft
Also called fetal fissure or embryonic fissure
Incomplete closure of fissure, will result in incomplete formation of certain structures and/or layers
What is a thickening in the surface ectoderm?
What forms the lens plate or placode?