BIO380H5 Lecture Notes - Lecture 4: Hyoid Bone, Fetus, Fgf8
Document Summary
Lecture 4 formation of germ layers and early development. Origin of cell lineages blastocyst has two types of cells: o o. Inner cell mas (icm): forms embryo and some extra embryonic membranes. Trophoblast: only forms extra embryonic membranes (future placenta) At this stage the blastocyst is free from the zona. Pellucida and these steps occur: apposition blastocyst will appose itself with the endometrial epithelium, adherence blastocyst will adhere, 3. trophoblast will adhere to the lining by adhesion molecules (l-selectin; trophinin) Cells express transcription factor nanog will already entered the inner cell mass earlier) Cells express gata 6 will develop hypoblast (later. The cells of hypoblast will start to line the trophoblast and sac. The epiblast will undergo cavitation to form the amniotic. Some cells will detach from the extra embryonic endoderm produce extra embryonic mesoderm embryo proper and contributes to yolk sac develop epiblast (these cells. Immigrants) come together to get the yolk cells (amniotic cavity) (parietal endoderm) to.
