Somite
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The somites are a set of bilaterally paired blocks of paraxial mesoderm that form in the embryonic stage of somitogenesis, along the head-to-tail axis in segmented animals. In vertebrates, somites sub
Human embryo at the end of week 4 with somite development.
Mesoderm
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The mesoderm is the middle layer of the three germ layers that develops during gastrulation in the very early development of the embryo of most animals. The outer layer is the ectoderm, and the inner
Somite
…metamere. In this definition, the somite is a homologously-paired structure in an animal body plan, such as is visible in annelids and arthropods. The mesoderm forms at the same time as the other two germ layers, the ectoderm and endoderm. The mesoderm at either side of the neural tube is called paraxial…
Cytology of normal mesothelium, with typical features. Wright's stain.