07 URCHIN CHICK DEV 2007

07 URCHIN CHICK DEV 2007 - Sea urchin Deuterostome...

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Development Sea urchin Deuterostome Isolecithal Holoblastic cleavage Chick Deuterostome Telolecithal Meroblastic cleavage Fertilization cleavage Blastulation & gastrulation Why do cells move in specific ways at specific times? How, why, and when do cells become specialized?
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Sea urchin body plan © 1997 Chris Patton, Stanford University
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Sea urchin fertilization acrosome Cortical granules Fertilization membrane
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© 1997 Chris Patton, Stanford University
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Fertilization
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Holoblastic--cleaves completely through cell Isolecithal--evenly dispursed yolk.
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Sea Urchin Cleavage and blastulation 1st div. 3 div. 8 cell blastula Hatched blastula
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Three types of morphogenetic movements during gastrulation.
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Gastrulation -2 types of morphogenetic movements. 1. Ingression of ~40 cells to form Primary mesenchyme cells (PMC) Formation of mesoderm.
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2. Invagination of cells at vegetal pole Forms blastopore and archenteron- primitive gut 3 germ layers ectoderm - skin and nervous system. mesoderm
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This note was uploaded on 11/10/2008 for the course BIO 206L taught by Professor Unknown during the Spring '08 term at University of Texas at Austin.

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07 URCHIN CHICK DEV 2007 - Sea urchin Deuterostome...

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