Anatomy and Cell Biology 3319 Chapter Notes - Chapter 3: Abdominal Cavity, Tangled, Amnion
12 Sep 2017
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The embryonic period: describe where fertilization and implantation normally occur, describe the fate of the inner cell mass and trophoblast during the second week of development, define gastrulation. Identify the 3 germ layers and describe 2 anatomical structures derived from each layer. Immature egg (haploid oocyte) released from one of 2 ovaries. )f happens later when inner cell mass hasn(cid:495)t differentiated, two: depends on one stage in the morula, splits and becomes two, monozygotic, 4 per 1000 births separate amniotic sacs but one wall (good model for cancer) Week 2: the two-layered embryo (differentiation: hypoblast sac = yolk sac (insignificant food source, digestive tube forms from it, tissue around yolk forms early blood vessels and blood cells. Intermediate mesoderm segmented structures: somites, continuous strip of tissue lateral to paraxial mesoderm. Inner epithelial lining of gut, respiratory tubes, digestive organs, bladder: secretory cells of glands form from this, thyroid thymus, parathyroid glands from pharynx, liver, pancreas.
