embryonic disk

References

Images

Two labeled diagrams show the human embryonic disk at 18 days: a three-quarter view and a cross-section, highlighting structures such as the amniotic cavity, yolk sac, embryonic shield, body stalk, and layers including ectoderm, mesoderm, and endoderm.

formation of the neural tube in prenatal development

embryonic disk: Media

biology

Images

Two labeled diagrams show the human embryonic disk at 18 days: a three-quarter view and a cross-section, highlighting structures such as the amniotic cavity, yolk sac, embryonic shield, body stalk, and layers including ectoderm, mesoderm, and endoderm.

human embryonic development

Development of the human embryo at 18 days, at disk or shield stage, shown in (left)...

Encyclopædia Britannica, Inc.

formation of the neural tube in prenatal development

formation of the neural tube in prenatal development

Cross section of the embryonic disk, showing formation of the neural tube in prenatal...

Encyclopædia Britannica, Inc.