Building a huma Flashcards
When is the embryonic period
First trimester
What happens in week one of embryological development
Implantation of the feertilized egg
What is embryological cleavage
Rapid cell divisions without growth forming a blastocyst (prepared for implantation)
What are the cells in a blasocyst
Inner cell mass
Trophoblast interacts with uterus
What are the layers of the blastodisc
epiblast and hypoblast
What is gastrulation
Cells in the primitive streak move between the epiblast and the hypoblast
What is neurulation
Formation of neural tube starts anteriorly and ceases posteriorly
Secondary neurulation - formation of lumen
What does the neural crest give rise to
neurones and neuroglia
What are the derivatives of the mesoderm
notocord
somites
kidney and gonads
body wall and gut musculature
What do morphogens do
Cells respond to morphogens which give information of spacial information within the embryo
What directs the development of the ventral spinal cord
notocord
What does sonic hedghog protein do
Its a morphogen; different tissues will get different concentrations of it and so will do different things
In the spinal cord**
