Embryology Flashcards
explain the Early development from fertilisation to implantation
Ball of cells keep on dividing untila morula is formed. Fluid then builds up and this forms a hollow ballcalled a blastocyst.
Name the 2 distinct cell populations (areas) of a blastocyst
The inner cell mass and the trophoblast.
What does the trophoblast do?
It aids the implantation and placenta development
What does the bilaminar germ disc consist of
The hypoblast and the epiblast.
What does the inner cell mass differentiate into
Into the epiblast.
What does the trophoblast differentiate into?
Into the hypoblast
What doesthe inner mass develop into?
Into the bilaminar disk
What is the head end called?
The cranial/cephalic end
What is the process of a bilaminar disk forming a trilaminar disk called?
Gastrulation
How is the endoderm formed.
Cells of the epiblast migrate towards the primitive streak and slip beneath it by replacing the hypoblast. They are the first cells to enter.
Where is the mesoderm and ectoderm located?
Mesoderm are above the endoderm and the ectoderm is above themesoderm.
What derives from the endodermal cells?
Most of the GI tract ,respiratory system and parts of the urinary system.
What derives from the mesodermal cells?
Connective tissue(mesenchyme), cardiovascular system, muscle and blood cells.
What derives from the ectodermal cells?
The nervous system, tooth enamel and epidermis
What is the notochord?
Rods of cells that develops from the primitive node and along the back
