The portion of the somite external to the central cavity becomes dermatome, while the internal portion differentiates into sclerotome and myotome. The sclerotome cells migrate centrally during week 4 to form the vertebrae and later skeletal structures.
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The myotome divides into a small dorsal (epaxial) and larger ventral (hypaxial) portion, supplied by primary dorsal and ventral spinal nerves respectively.
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