Somite
Each of several blocks of mesoderm that flank the neural tube on either side in embryogenesis / From Wikipedia, the free encyclopedia
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The somites (outdated term: primitive segments) are a set of bilaterally paired blocks of paraxial mesoderm that form in the embryonic stage of somitogenesis, along the head-to-tail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 subdivide into the dermatomes, myotomes, sclerotomes and syndetomes that give rise to the vertebrae of the vertebral column, rib cage, part of the occipital bone, skeletal muscle, cartilage, tendons, and skin (of the back).[2]
Somite | |
---|---|
Details | |
Carnegie stage | 9 |
Days | 20[1] |
Precursor | Paraxial mesoderm |
Gives rise to | Dermatome, myotome, sclerotome, syndetome |
Identifiers | |
Latin | somitus |
MeSH | D019170 |
TE | E5.0.2.2.2.0.3 |
FMA | 85522 |
Anatomical terminology |
The word somite is sometimes also used in place of the word metamere. In this definition, the somite is a homologously-paired structure in an animal body plan, such as is visible in annelids and arthropods.[3]