Primitive pit

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Primitive pit
Gray14.png
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 of part of the primitive streak.

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This article incorporates text from a public domain edition of Gray's Anatomy.