notochord

And divided the embryonic development into four main stages: Cleavage, the formation of archenteron notochord and coelomic mesoderm, the formation of embryonic membranes and the organo-genesis;

将胚胎发育主要分为4个时期：卵裂期、原肠脊索与体腔中胚层形成期、胎膜形成期和器官发生期；

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In certain breeds of dogs, notochord cells remain vibrant in the intervertebral disc into adulthood.

在一些犬类,直到成年, 椎间盘内的脊索细胞仍活跃.

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the notochord is straight and caudal fin structures are beginning to form on the ventral side of the notochord .

此时脊索是直的，而且尾鳍的结构开始在脊索的腹侧边上形成。

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Proteoglycan and collagen from notochord cells through swelling pressure to resist the mainly compression force.

由脊索细胞分泌的蛋白多糖与胶原组成的网络可以形成肿胀压以抵抗压缩应力。

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After 29-32 h of grafting, the medial wall of DC somite was broken down and migrating mesenchymal cells moved toward notochord and formed sclerotome ( the sclerotome in situ) between myotomes and neural tube as well as notochord.

移植后29～32h，靠近神经管的DC体节向中壁破裂，外迁的间充质细胞在生肌节与神经管和脊索之间，形成生骨节（即原位生骨节）。

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fishlike animals having a notochord rather than a true spinal column.

有脊索但无真正的脊柱鱼类动物。

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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；

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Free-swimming larva of ascidians; they have a tail like a tadpole that contains the notochord.

自由游动的海鞘类幼体；它们有含有脊索的蝌蚪形尾巴。

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Tip cell maturation and aging as the notochord, and notochord cells, regulation and function-related protein expression gradually decreased.

提示随着脊索细胞成熟和老化，与脊索细胞调控和发挥功能相关的蛋白表达量逐渐下降。

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