Flashcards in embryology Deck (44)
what is the name for a fertilised ovum?
what is a morula?
mass of cells
how many days in to a pregnancy is a morula formed?
what is a blastocyst?
hollow ball of cells with inner cell mass
when during pregnancy is a blastocyst formed?
how is the baby and mothers blood mixing prevented?
they are separated by a thin barrier known a the placenta
what is the placenta permeable to?
most molecules other than cells
when the embryonic inner cell mass forms 2 layers it is referred to?
at how many days does the embryo become a bilaminar embryo?
what are the 2 layers of the bilarminar embryo called?
epiblast and hypoblast
what us the function of the epiblast in the bilaminar embryo?
gives rise to embryonic ectoderm
what us the function of the hypoblast in the bilaminar embryo?
participates in formation of endoderm and extra embryonic mesoderm
which twins are formed by splitting before fertilisation?
which twins are formed from 1 egg?
what is gastrulation of the embryo?
it forms an axis and 3 embryonic layers
what is the groove formed during gastrulation known as?
which 2 layers form the endoderm?
mesoderm and hypoblast
which cells form the mesoderm?
what is the name given to the early 3 layered embryo?
what does the primitive streak develop into?
when does the neural tube develop?
what is the name given to the development of organs from the 3 basic germ layers?
what is one of the 1st organs to form in an embryo?
what embryonic structure forms the CNS?
what is the name of the 4th embryonic layer?
which layer forms the ectomesenchyme?
which layer of the embryo is important for the development of the head?
when in the development of an embryo does it start to take shape?
at which point in the development of a foetus does it have developed organs ?