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)。
So did the dorsal root ganglia in situ as the sclerotome in situ. 原位背根神经节只位于每个生骨节的前半个,其数量和排列完全依赖于原位生骨节。