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Lecture 4

lecture 4.docx

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ZOO 2090
Fred Laberge

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Lecture 4- Development 10/24/2013 7:29:00 AM Early development of chordates 1. cleavage  from zygote to multicellular hollow blastula 2. formation of germ layer  aka archenteron : space enclosed by the gut 3. neurulation: formation of the neural tube 4.differentiation: from germ layers to basic tissues  epithelium  connective tissues  muscle  nervous tissue 5. Organogenesis: from tissue to organs  Differentiation of organs from tissues involve interactions and mixing between germ layers  lots of cellular movement in the embryo!  Fate of ectoderm  nervous system, eye parts, epidermis  Fate of endoderm  pharynx, digestive track, liver, pancreas, urinary bladder  Fate of mesoderm  dermis, bones, muscles, blood vessels, heart, kidney, gonads 6. Neural crest  Arise by delamination from the neural tube and peripheral migration  Present in urochordates, where it gives rise to pigment cells. Gives rise to a variety of structures in adult vertebrates, 7. Placodes  Ar
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