鄭先祐(Ayo) 製作
補充 Development's phases for human
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beings.
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Table 16-1 Early stages of
development
1. Fertilization (受精)
2. Cleavge (卵割)
3. Morula (桑椹胚)
3. Blastula (囊胚)
3. Gastrulation (原腸胚形成)
4. Neurulation (神經管形成)
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2
補充 Late stage of development of the
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allantois in a chick
embryo.
3
Amnion
chorion
allantois
Yolk sac
Extraembryonic
coelom
補充 Early stage of development of the allantois
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in a four-day-oldLifechick
embryo.
4
補充 Embryo of placental mammal.
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5
補充 various vertebrates
embryos at the
organogenesis stage of
development illustrating
similarity of gross structure.
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Fig. Schematic of the Saunders-Zwilling hypothesis for the mutual
interactions of the apical extodermal ridge (AER) and mesoderm.
The AER stimulates mesodermal outgrowth, while an apical
ecotodermal maintenance factor (AEMF) from mesoderm promotes
the health and well being of the AER. The zone of polarizing activity
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(ZPA) may influence anterior-posterior
determination.
Fig. Experimental procedures (a, b) and results (a', b') of grafting
additional putative zones of polarizing
activity (ZPA) to different sites on8
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Fig. In the normal limb (A), the zone of polarizing activity is presumed
to be the source of morphogen, which would theoretically diffuse across
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the limb to form a concetration Life
curve,
as seen in B.
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