Lec26+2010 - Lecture 26: Vertebrate Development II...

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Lecture 26: Vertebrate Development II Required reading Chapter 47, pages 1025 -1044 Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Wednesday Nov. 24
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Main Concepts Embryonic development can be divided into four stages Fertilization - combination of sperm and egg nuclei and egg activation Cleavage - rapid cell divisions without substantial growth in size to generate a multicellular embryo Gastrulation - mass cell movements to generate three germ layers Organogenesis - localized changes in tissue and cell shape Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved
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Organogenesis Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Formation of rudimentary organs from the 3 germ layers Mesoderm gives rise to notochord and somites Neural tube and neural crest cells are induced to form from ectoderm Figs. 47.10 & 47.12
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1. The notochord forms from the dorsal mesoderm 2. Signals from the notochord to the ectoderm forms the neural plate Early vertebrate organogenesis Fall 2010, Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Fig. 47.12a
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Formation of the future brain and spinal cord.
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Lec26+2010 - Lecture 26: Vertebrate Development II...

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