1·A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.
脊椎动物胚胎中胚层中的体节物质，沿脊索成对出现，后生长成肌肉或脊椎。
2·The soft anatomy of conodont shows some soft tissues including eyes, notochord, nerve cord, myomeres and caudal fin.
英国古生物学家们通过牙形石动物的软体解剖学研究，发现眼睛、脊索、神经索、肌肉组织、尾鳍等软组织；
3·Right now the notochord cell between vertebra is added gradually much.
此时椎间的脊索细胞逐渐增多。
4·Right now notochord cell disappears, pith nucleus becomes a fiber cartilage with soft and less cell gradually.
此时脊索细胞消失，髓核逐渐成为一个软而细胞较少的纤维软骨。