from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See metamere.
  • n. A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One of the paired masses of mesoderm distributed along the sides of the neural tube that will eventually become dermis, skeletal muscle, or vertebrae.
  • n. A metamere, one of a series of segments, arranged longitudinally, of which some animals are composed.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is composed; somatome; metamere.

from The Century Dictionary and Cyclopedia

  • n. An actual somatome; any one morphological segment of an articulated body, such a body being viewed as composed of a longitudinal series of somites; an arthromere or metamere of an articulate invertebrate or a diarthromere of a vertebrate; such a segment considered with or without the appendages it may possess; in the latter restricted sense, a metamere minus its appendages, or a segment of the soma or trunk without the limbs it may bear.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one of a series of similar body segments into which some animals are divided longitudinally


from The American Heritage® Dictionary of the English Language, 4th Edition

Greek sōma, body; see soma1 + -ite1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

soma +‎ -ite


  • The genes affecting somite subdivision by the horizontal myoseptum might represent members of these signalling processes (Figure 5G).

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  • The somite pattern in the fish embryo is much less complex than the segment pattern of the Drosophila larva.

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  • The first segment, which is almost half-way down in the embryonic shield of the amniote, is the foremost of all; from this first somite is formed the first cervical vertebra with its muscles and skeletal parts.

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  • In addition we have also demonstrated the physiological PNS potential of 8 weeks old NPs 7 days after implantation of the cells into the developing neural tube (NT) of 18-23 somite chick embryos in ovo.

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  • The current study was carried out to test whether any of the five major signaling pathways are regulated by tbx16 during two specific stages of mesoderm development: primitive red blood cell formation in the intermediate mesoderm and somite formation in the tail paraxial mesoderm.

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  • When the wave of gene expression encounters a set of responsive cells, those cells are specified to become the next somite. - latest science and technology news stories

  • Pdx-1 is expressed in the mouse primitive gut as early as the 13 somite stage (E8. 5), about a day before endocrine gene expression and 1.5 days before the first morphologic evidence of pancreas organogenesis.

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  • These two body segments are connected with a small waist called the pedicle or the pregenital somite.

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  • Normal Lfng expression and anterior-posterior somite patterning is highly sensitive to reduced POFUT1 levels in early mammalian embryos, whereas other early Notch-dependent processes such as establishment of left-right asymmetry or neurogenesis are not.

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  • Alternatively, reduced O-fucosylation might preferentially affect sites that are substrates for LFNG and thus important for somite formation and patterning.

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