BI 328 Lecture Notes - Lecture 1: Petri Dish, Fate Mapping, Gastrulation
14 Jan 2017
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Document Summary
Formed when egg cell and sperm cell join together. Not all cell will necessarily be the same size. Creates a blastula made out of blastomeres. During this stage, cells move to the locations they need occupy for differentiation. Movement to form germ layers of the embryo. Endoderm (inner layer), mesoderm (middle layer), ectoderm (outer layer) Neural tube formed first on the dorsal side of the embryo. Polarity determined by where the sperm meets the egg. Blastopore formed directly opposite where the sperm meets the egg. Sperm enters the egg on the ventral side. Dorsal (back; toward the back), ventral (front; toward the abdomen), lateral (side; toward the left or right), anterior (top; toward the head), and posterior (bottom; toward the tail/bottom) regions. Epithelial cells tightly connected to each other. Mesenchymal cells aren"t connected and work independently. Determines which cells give rise to later differentiated cells. C. elegans has 959 cells and the origin of each cell is know.
