Primitive pit

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Primitive pit
Surface view of embryo of Hylobates concolor. The amnion has been opened to expose the embryonic disk. (Primitive pit not labeled, but region is visible.)

The primitive pit is a depression in the center of the primitive node, connecting to the notochord. It consists part of the primitive streak.

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Developmental biology > Human embryogenesis (development of embryo) and development of fetus (some dates are approximate - see Carnegie stages and a timeline)
Week 1
Week 2
Week 3 (Trilaminar embryo,
germ layers)
Extraembryonic/uterus
Histogenesis
Organogenesis