887
CHAPTER TWENTY-THREE
Reproductive System
Yolk sac
Ectoderm
Mesoderm
Endoderm
Chorionic villi
Connecting stalk
Tail end
Allantois
Neural tube
(Spinal cord)
Skin
Brain
Chorion
Heart
Digestive
tract
Amniotic
fluid
Amnion
FIGURE 23.11
Each of the primary germ layers collectively serve as primitive tissues from which all organs form.
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