neural development Flashcards
what is sequence of early development
zygote to blastula to gastrula
what is the phylotypic stage
the stage where embryos look very similar
what is induction?
the process where a cell or tissue signals to another cell or tissue in embryo which affects the development of responding cell or tissue
what is competence
the ability of a cell or tissue to respond to an inducing signal, embryonic tissues only remain competant for a limited period of time
what were the first surnames of the scientists who conducted experiments showing induction
spemann and mangold
what is a morphogen
a protein that gives positional information to cells via a concentration gradient that alters cell fates
what is an organising centre
a group of inducing cells
what is positional information
french flag problem, organising centres induce cells to do with position so when grafted tissues are placed where they are not meant to be it results in other tissues
grafted notochord induces ectopic floorplate which induces motor neurones
where is sonic hedgehog made
notochord and floor plate
