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Left A 4-week embryo. The celerotomes consist of loosely arranged cells cranially and densely packed cells caudally. Right The densely packed cells fuse with the loosely arranged cells of the caudal sclerotome to form the vertebral body. The intervertebral disc is form from cranial section of the densely arranged cells. A Sclerotomes, B loosely arranged cells cranially, C densely packed cells caudally, D inter-segmental arteries, E notochord
