Lect 22 Animal Development (1)

Lect 22 Animal Development (1) - www.monash.edu.my BIO1022...

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Unformatted text preview: www.monash.edu.my BIO1022 ANIMAL DEVELOPMENT II ANIMAL DEVELOPMENT II ____ __ ____ _____ ____ ______ _____ _____ ____ _____ _____ _____ ____ _____ Click to edit Master text styles Second level Third level Fourth level Fifth level www.monash.edu.my 2 www.monash.edu.my Organogenesis Morphological changes in the germ layers to give rise to organ structures First structures in vertebrates are neural tube and notochord Notochord is formed from dorsal mesoderm > Notochord elongates and stretches embryo along anterior-posterior axis Dorsal ectoderm above notochord becomes neural plate Neural plate folds inwards to become neural tube > Will become brain and spinal chord ____ __ ____ _____ ____ ______ _____ _____ ____ _____ _____ _____ ____ _____ Click to edit Master text styles Second level Third level Fourth level Fifth level www.monash.edu.my 5 www.monash.edu.my Organogenesis Strips of mesoderm lateral to notochord form blocks called somites These later give rise to vertebrate and muscles associated with axial skeleton Lateral to the somites the mesoderm splits into two parts Form the lining of the body cavity Morphogenesis and cellular differentiation continue to refine the organs ____ __ ____ _____ ____ ______ _____ _____ ____ _____ _____ _____ ____ _____ Click to edit Master text styles Second level Third level Fourth level Fifth level www.monash.edu.my 6 www.monash.edu.my Phylotypic Stage After neural induction, vertebrate embryos resemble each other Further differentiation of organs will determine the final structure of the animal ____ __ ____...
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This note was uploaded on 03/31/2011 for the course PHR 1922 taught by Professor Dean during the Three '11 term at Monash.

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Lect 22 Animal Development (1) - www.monash.edu.my BIO1022...

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