Primitive groove

(Anat.)

a depression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it.- Shipley.

primitive groove

prim·i·tive groove

(prim'i-tiv grūv) The median depression in the primitive streak flanked by primitive ridges.

primitive groove

In the embryo, a shallow longitudinal midline groove in primitive streak of the blastoderm. The rostralmost end of the primitive groove becomes the primitive pit, a circular depression through which surface cells descend during gastrulation. See also: groove

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