Term
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Definition
| top part of the sperms head |
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Term
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Definition
membrane that contains waste produced by the embyro
-removes and store waste |
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Term
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Definition
test that uses a sample of the amiotic sac to tell the condtion of the fetus, ie diseased, sick, etc.
-tkaes too long
- 2nd trimester
-chorionic villus sampling faster- 8 weeks after pregnancy |
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Term
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Definition
| sac that protects the embyro |
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Term
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Definition
| first form cavity of gastrualtion |
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Term
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Definition
| structure formed in early embryogenesis, after the formation of the blastocoel, but before implantation. |
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Term
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Definition
| A layer of cells on the inside of the blastula |
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Term
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Definition
| cell formed in the first stages of embryonic development, after the splitting of the fertilized ovum, but before the formation of the blastula or blastocyst. |
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Term
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Definition
| opening into the archenteron during the embryonic stages of an organism |
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Term
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Definition
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Term
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Definition
membrane that seperates the mother from the fetus, outside the placenta
chorion + uterin wall =placenta |
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Term
cleveage
-complete
-discoidal
-incomplete
-spiral
-superficial ( happens id drosophilia)-frit flies |
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Definition
-complete: little yolk
-discoidal: cleavage furrow doesn't penetrate the egg---> creates a blastodisc
-incomplete: lots of yolk
-spiral: cleavage planes are oriented obliquely to the polar axis of the oocyte. ie mollusk
-superficial:mitosis occurs but not cytokinesis( plasma split between two daughter cell), resulting in a polynuclear cell. ie arthropods |
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Term
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Definition
-form at sight of the grey crescent
-site of involution and gastrualtion |
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Term
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Definition
-outer most germ layer
-destine to be skin, sensory, nervous system/organ/ function |
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Term
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Definition
innermost germ layer
-destine to be digestive/ respiratory tract |
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Term
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Definition
| The epiblast, whilst referred to as the primary ectoderm, differentiates to form all three layers of the trilaminar embryonic disc in a process called gastrulation. |
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Term
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Definition
usually the growth of epidermal ectoderm to cover the surface of the embryo during gastrulation.
-involution |
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Term
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Definition
| period during which the embyro develops in the uterus |
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Term
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Definition
-becomes the dorsal lip later
-form on the opposite side of sperm entry
-regulate fates of cells ( which cell turns into |
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Term
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Definition
| cells that contain half sets of chromosomes ie sperm and egg cell |
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Term
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Definition
in avian embyros
-structure at anterior end of the primitive groove
-determine fates of cells passing over it during gastrulation |
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Term
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Definition
segment of DNA that regulate expression of genes, controlling large scale development processes
-180 base-pair segment of DNA |
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Term
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Definition
| lower portion of the avian blastula, joined to epiblastat margins of blastodisc |
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Term
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Definition
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Term
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Definition
| cell disvision w/ 4 daughter cells ( halploid) |
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Term
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Definition
middle layer in developing embyro
- fated to become skeletal muscle, excretory, circulatory, and reporductive system |
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Term
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Definition
| cell division into two cells, identical cells |
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Term
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Definition
| pattern of animal embyroic developement in which each blastomere contribute to a specific part of the human body |
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Term
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Definition
-created by two opposing folds of doral ectoderm.
-leads to the future developement of vertebrae nervous system
-neurual plate is formed by neural fold, then neural grove, the neural tube |
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Term
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Definition
| early formation of the nervous system |
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Term
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Definition
-serves as support in the embyro
- form the spinal cord eventually |
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Term
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Definition
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Term
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Definition
- usually the dorsal lip
-direct the developement of nearby regions |
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Term
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Definition
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Term
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Definition
| organ that nutures the fetus and eliminates its waste |
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Term
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Definition
| close? as oppose to distal |
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Term
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Definition
fate cells can differentiate into many things
-undefined |
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Term
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Definition
region of the germ body
-segmented blocks of cells along the notochord of mesoderm
-produce cells that become the vertebrae,ribs, limbs
- releases mesenchyme, which forms the three germ layers |
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Term
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Definition
-diploid
-early sperm cell |
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Term
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Definition
| cells that become the placenta at the 32-cell stage of mammalian developement |
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Term
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Definition
| bottome hemispher of embyro |
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