protovertebral+segment

См. также в других словарях:

• primitive segment — primordial segment, protovertebral segment somite …   Medical dictionary

• somite — One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction typically until 42 pairs are… …   Medical dictionary