this week in 206 i. sea urchin fertilization thru gastrulation. ii. chick gastrulation thru...
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This week in 206
I. Sea urchin fertilization thru gastrulation.
II. Chick gastrulation thru organogenesis.
III. Fungi fertilization and sporangium development.
Dr. Lloyd
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DevelopmentSea urchinDeuterostomeIsolecithalHoloblastic cleavage
ChickDeuterostomeTelolecithalMeroblastic cleavage
Fertilization
cleavage
Blastulation & gastrulation
Organogenesis & pattern formation
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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Fertilization
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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 blastulation1st div. 3 div.
8 cell
blastula Hatchedblastula
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Three types of morphogenetic movements duringgastrulation.
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Gastrulation -2 types of morphogeneticmovements.1. Ingression of ~40 cells to formPrimary mesenchyme cells (PMC)Formation of mesoderm.
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Gastrulation2. Invagination of cells at vegetal poleForms blastopore and archenteron-primitive gut
3 germ layersectoderm-skin and nervous system.mesoderm-bone, muscle, circ. system, internal organs.endoderm-stomach and guts.
archenteron
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2nd ingression of cells to formSecondary mesenchyme
Primary mesenchyme
Together=mesoderm
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archenteron
2nd invagination at animal poleto form mouth
Complete gastrula
EctoMesoEndo
Germ layers
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Sea urchin larval development.
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Sea urchin larva
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NucleusCytoplasmYolk
Telolecithal-asymmetric
shellShell membrane
albumen
Meroblastic cleavage-part cleavage
1st div. 2nd 3rd
4th
Chick
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~100,000 cells when egg laid.Epiblast - 3 germ layers
ectodermmesodermendoderm
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Delamination
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Ingression-mesoderm
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Chick gastrulation.
Primitive streak-cells ingress-induced by hypoblast~blastopore
Notochord-induced by Hansen’s nodeSomites-muscle, bone
Embryo lifts off surface-3 layers-ectodermmesodermendoderm
Becomes brain
Sacs form around embryo
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Fresh laid egg-blastodisc 13 hour egg
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24 hour chick sections
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33 hour chick sections
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33 hour whole mount
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48 hour 72 hour
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