| 单词 | primitive groove |
| 释义 | > as lemmasprimitive groove primitive groove n. Embryology a longitudinal groove or furrow which appears in the midline of the primitive streak. ΘΚΠ the world > animals > animal body > general parts > constituent materials > [noun] > groove marking beginning of backbone primitive groove1857 1857 Proc. Royal Soc. 9 429 The primitive groove extends to the extremity of the future cranial cavity. 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xviii. 297 Before the blastopore is closed a longitudinal furrow appears in the ectoderm on the dorsal side extending forward directly over the incipient notochord. This furrow is called the primitive or medullary groove. 1991 Science 18 Jan. 311/2 Hensen's node, a group of cells located at the rostral tip of the primitive groove, gives rise to the notochord. < as lemmas |
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