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35 Cards in this Set
- Front
- Back
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yolk
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provides nutrients and potential energy to the developing embryo
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development
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includes the sequence of changes through which the organism passes during its entire life span
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why is early embryonic development important?
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it is when the pattern of organism originates
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cleavage
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series of rapid mitotic divisions undergone by the zygote
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zygote
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fertilized egg
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blastulation
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formation of a mass of cells containing a central cavity
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gastrulation
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characterized by the movement of groups of cell that results in the formation of the rudimentary digestive tract
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cells organize into these 3 germ layers
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ectroderm, mesoderm and endoderm which will form the skin, nervous system, muscles, bones, digestive tract, etc.
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unfertilized egg
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a conspicuous nucleus with a nucleolus is visible
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blastomeres
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two cells that are produced by the first mitotic division that occurs through the poles
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vegetal poles
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end of egg where most yolk is concentrated
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animal pole
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end of egg where the least yolk is concentrated
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blastula
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continued divisions form this hollow ball of cells
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blastocoel
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fluid-filled cavity of the blastula
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gastrula
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after the development of the blastula, cells on one side of the blastula fold inward to form a two-layered......
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archenteron
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inaginated part of the gastrula
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blastopore
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opening to the outside at the end of the archenteron
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ectoderm
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outer part of cells of the archenteron
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endoderm
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inner layer of cells to the archenteron
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Cleavage results in..
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the formation of the blastula
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yolk plug
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yellow spot found in the embryo of a frog egg. it is the blastopore where cells are invaginating but is pluggged by yolk cells that don't invaginate
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frog development: gastrula
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migration of cells from the outer surface has resulted in a 3-layered embryo
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frog development: neural folds
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two strips of ectoderm grow upward to form ___. forming a neural groove
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frog development: neural tube
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the edges of folds eventually meet and fuse along a midline in later stages. formed uner skin of embryo
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frog development: notochord
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induces formation of the nervous system
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chicken development: yolk
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egg proper that's enclosed in a delicate vitelline membrane
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chicken development:albumen
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egg white that surrounds the yolk
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chicken development: chalaza
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twisted fibrous strands of albumen
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chicken development:blastodisc
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living part of the egg. a small white dot
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chicken development: cleavage produces a...
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blastoderm
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33 hour chick incubation
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most outstanding feature is folding of tissues at the anterior end to form 3 major aread of the brain, forebrain, midbrain and hindbrain
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chicken development: optic vesicles
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become the eyes of the chick
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chicken development:neural tube
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contains the spinal cord.
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chicken development:primitive streak
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region of the embryo through which cells move into the interior during gastrulation
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chicken development: somites
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develop into the skeleton and skeletal muscles
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