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APBiologyCh47

APbioLHSCh.47:Embryonic Development

stage/structuredescription
blastomeres small cells of zygote
animal pole may be anterior (head) of embryo:low conc. of yolk
blastocoel fluid filled cavity w/in morula(ball of cells)
gastrula 3 layered embryo (triploblastic)
blastula cell cleavage makes this hollow ball stage
embryonic germ layers ecto-, endo-, & mesoderm
blastopore open end of archenteron (anus of deuterostomes, mouth of protostomes)
dorsal lip of blastopore where cells involute into blastocoel
notochord dorsal mesoderm condensed abv archenteron w/neural tube
amniotes birds, reptiles& mammals w/embryo is surrounded by fluid
primitive streak marks bird's anterior-posterior axis
extraembryonic membranes 4 membranes supporting egg develpmnt:yolk sac, amnion, chorion & allantois
trophoblast forms placenta
blastocyst human embryo of >100 cells
convergent extension cell crawling elongates sheet of cells
Created by: sedgar
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