Gastrulation Flashcards
Which cell layer of the Bilaminar disc is ventral and which is dorsal?
Epiblast is dorsal
Hypoblast is ventral
When do syncytiotrophoblast and cytoptrophoblasts begin to undergo placentation?
In week 3
When does formation of the primitive streak begin?
Week 3
What is the primitive streak?
A slender midline structure with cellular enlargements surrounding it
What is the expansion of the primitive streak at the cranial end and what is the indentation called?
The primitive node and the primitive pit
When does development of the trilaminar disc begin?
Week 3
When does the future position of the cloacal membrane appear?
Week 3
What happens to cells in gastrulation?
Cells start to delaminate along the edge of the Bilaminar disc and move ventrally into the hypoblast layer. The new cell layer is the endoderm
What kind of cells fill the gap cause by gastrulation?
Mesodermal
What is ingression?
Movement and delimitation of cells between the endoderm and ectoderm
Where does the prechordal plate develop?
Along the primitive streak
What cranial structure do cells move towards from the primitive streak during ingression?
The oropharyngeal membrane
What is the function of the pre-chordal plate?
To act as an inducer to push the notochord up to the oropharyngeal membrane
What is the function of the neurenteric canal?
It allows communication between the amniotic cavity and yolk sac
What do the delaminated cells form during notochord formation?
A hollowed out tube
