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Somite |
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somite [′sō‚mīt]
(zoology) Somite a paired metameric formation in the embryos of such invertebrates as annelids and insects and in the embryos of man and all other chordates. The middle germ layer, or mesoderm, is segmented into somites during embryonic development. The somites are arranged along the longitudinal axis of the body alongside the neural tube and the chorda. The entire mesoderm is segmented in invertebrates, whereas in man and other chordates only its dorsal section is segmented, with the remaining mesoderm forming lateral plates, or splanchnotomes. Segmentation begins from the anterior section of the body and gradually extends to the posterior section. In the process of development, each somite decomposes into a myotome, a sclerotome, and a dermatome, from which are formed, respectively, the truncal musculature, the axial skeleton (in fish, also the skeleton of the fins), and the connective-tissue portion of the skin and its derivatives. T. A. DETLAF Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | 1 2 3 1 2 3 4 5 Maxillipeds Pereopod Thoracic Somite Appendages 1 2 3 1 2 3 4 5 Pleurobranchs - - - + + + + + Arthrobranchs - - - 1 1 1 1 - Podobranchs - r - - - - - - Epipods + + + - - - - - Exopods + * - - - - - - - Setobranchs - - - - - - - - TABLE 2. 2002), injecting a CdSe/ZnS micelle (PEG-PE and phosphatidylcholine) conjugated with an oligonucleotide into Xenopus embryos, observed QD labeling of all embryonic cell types, including somites, neurons, axonal tracks, ectoderm, neural crest, and endoderm. Typically, KFS results from failure of the normal segmentation of the somites during weeks 3 to 8 of gestation. |
Somite |
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