Development and Division of the Somite
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In tracing the origin of the vertebrae it is appropriate to begin with the development, segmentation and sequential subdivision of the paraxial mesoderm into pre-somitic mesoderm, pairs of somites, and sclerotome, dermatome and myotome. Williams (1910) provided the first comprehensive account of formation and segmentation; of the somites (in the embryonic chick) and recently Lipton and Jacobson (1974a) have provided an elegant account of these early stages.
KeywordsNeural Plate Primitive Streak Embryonic Chick Neural Arch Spinal Ganglion
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