12-NeurulationandAxisInduction

12-NeurulationandAxisInduction - DevelopmentalBiology

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Neurulation and axis induction Developmental Biology November 16, 2005
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Figure 1.6 Gastrulation germ layers form Organogenesis germ layers interact to form the organ rudiments Tissue differentiation organ rudiments become functional organs
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Organogenesis ­ basic body plan is formed during organogenesis ­ head with brain, eyes, ear rudiments ­ internal organs: rudiments of gut, heart, lung, kidney etc. ­ basic body plan is typical for entire phylogenetic group Figure 12.2
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Organogenesis is controlled by inductive interaction : Induction increases complexity of an organism (mesoderm induction, induction during organogenesis) Induction is the primary mechanism for the generation of different structures along body axes inducing cells (signal producing) responding cells (signal receiving) Competence : responding cells react to inducing signals only for a short period of time
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Neurulation as an example of organogenesis ­ neural plate formation: area along dorsal midline with columnar cells (a) ­ formation of a neural groove (b) ­ neural folds (c) ­ neural folds close the neural plate into the neural tube (d) Figure 12.1
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This note was uploaded on 12/12/2010 for the course BIO 231 taught by Professor Hilliar during the Spring '10 term at University of Houston.

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12-NeurulationandAxisInduction - DevelopmentalBiology

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