CAS BI 105 Lecture Notes - Lecture 13: Microtubule, Embryonic Disc, Advanced Maternal Age
14 Dec 2017
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Document Summary
Ectoderm neural crest and neural tube. Cells of epidermis (top layer of our skin) Mesoderm forms muscles, bone, cartilage, tissues. Endoderm lining of organs and cardiovascular system. We start from a ball of cells which are all the same and get to many different kinds of cells (differentiation). In the mesoderm, the hard notochord is going to form. Starts with neurulation formation of the nervous system (chordates) Doral (posterior) mesoderm cells pinch off to become a rod called notochord (becomes the vertebral discs). Then, ectoderm cells above this site change shape and curve inward (neural plate) Neural plate invaginates and pinches off, becoming neural tube. Neural crests crests close up the neural tube (which will become the spinal cord). In between the neural crests there are some neural crest cells which will become the nerves of the body. When the neural crests join together they transform into the outer layer of ectoderm.
