Transcription of MESODERM FORMATION / SEGMENTATION
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MESODERM FORMATION / SEGMENTATION
FORMATION / SEGMENTATIONREADING ASSIGNMENT: Larsen Human Embryology, 3rd Edition, pp. 79-85, :During the third and fourth weeks of embryonic development the MESODERM is established as the 2ndgerm layer. The mesodermal cells are organized into 4 regions: the axial MESODERM of the prechordalplate and notochord, paraxial MESODERM , intermediate MESODERM and lateral plate MESODERM . Each ofthese undergoes some form of SEGMENTATION . The most evident and complete SEGMENTATION occurs in theparaxial trunk MESODERM , where each segment becomes an entirely separate somite. Much of theparaxial and lateral plate MESODERM develops into mesenchyme, an embryonic connective tissue.
5-2 Dermatome - The dorsolateral part of the somite that will contribute to the dermis of the skin. Epimere - Segment of myotome that is dorsal to the body axis. Hypomere - Segment of myotome that is ventral to the body axis.
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