development of an embryo Flashcards
1
Q
What is gastrulation?
A
An early developmental process that occurs in the third week, in which an embryo transforms from a one-dimensional layer of epithelial cells (blastula) and reorganizes into a multilayered and multidimensional structure called the gastrula. The ectoderm is identifiable.
2
Q
What is neural induction, and when does it occur?
A
It occurs to form the neural plate and eventually, will form the entire nervous system. It occurs during gastrulation.
3
Q
What is neurulation?
A
It’s when there is an elongation of the embryo and folding of the neural plate to form the neural tube. It occurs during the fourth week. Also, a ‘head’ and ‘tail’ end are determined by differential gene expression.
