Does anybody have any mnemonics or a way they keep straight that the adrenal medulla is derived from the ectoderm and the adrenal cortex is from the mesoderm?
I’ve been really trying to grasp embryonic development but am struggling to understand when gastrulation occurs in relation to implantation.
If I understand correctly the blastocyst must get rid of it’s zona pellucida via zona hatching. This reveals the trophoblast which implants the blastocyst into the uterus. However, deep to the trophoblast is the epiblasts which form the primitive streak that begins gastrulation followed by neurulation.
My question is: does gastrulation and subsequent neurulation occur prior to implantation or after? Or is this all kind of happening simultaneously?
I don’t know if zona hatching and subsequent implantation had to occur prior to the epiblast forming the primitive streak etc etc. I’ve tried looking it up but can’t find a good clear cut answer.
