Primitive pit

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

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.)
Anatomical terminology


    This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

    • "The trilaminar germ disk (3rd week)". Retrieved 2017-03-12.

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