Primitive groove

A shallow groove, the primitive groove, appears on the surface of the primitive streak, and the anterior end of this groove communicates by means of an aperture, the blastophore, with the yolk-sac.

单词	Primitive groove
释义	Primitive groove 英语百科 Primitive groove A shallow groove, the primitive groove, appears on the surface of the primitive streak, and the anterior end of this groove communicates by means of an aperture, the blastophore, with the yolk-sac.
随便看	graduating accuracy的意思 graduating class的意思 graduating classes的意思 graduating device的意思 graduating diaphragm的意思 graduating function的意思 graduating machine的意思 graduating mark的意思 graduating nut的意思 graduating of acute respiratory distress syndrome的意思 graduating of asthma acute attack phase的意思 graduating of bronchial asthma digree的意思 graduating of state of illness of bronchial asthma的意思 graduating release position的意思 graduating sleeve的意思 graduating spring的意思 graduating spring sleeve的意思 graduating stem的意思 graduating stem nut的意思 graduating valve的意思 graduating valve lever的意思 graduating valve spring的意思 graduating with cutter的意思 graduatioin的意思 graduation的意思