Primitive pit
Primitive pit is the thickened anterior end of the primitive streak; an important source of inductive signals during early development, in the primitive streak phase. It appears as is a depression in the center of the primitive knot, connecting to the notochord. It consists of part of the primitive streak.
Embryonic development[edit | edit source]
During the development of the embryo between first cleavage and 72 h of incubation was divided into the following phases: cleavage phase (Stages 1 to 6), area pellucida formation (Stages 7 to 9), hypoblast formation (Stages 10 to 14), primitive streak (Stages 15 to 17), somite(Stages 18 to 27), and organogenesis (Stages 28 to 33).
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Contributors: Prab R. Tumpati, MD
