| 释义 |
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. |
See also: Primitive EncyclopediaSeegrooveprimitive groove
prim·i·tive groove (prim'i-tiv grūv) The median depression in the primitive streak flanked by primitive ridges. primitive grooveIn 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 |