somite


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Related to somite: neural crest

somite

 [so´mīt]
one of the paired segments along the neural tube of a vertebrate embryo, formed by transverse subdivision of the thickened mesoderm next to the midplane, that develop into the vertebral column and muscles of the body.
Somites in a 22-day embryo. From Dorland's, 2000.

so·mite

(sō'mīt),
One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction typically until 42 pairs are formed.
Synonym(s): mesoblastic segment
[G. sōma, body, + -ite]

somite

(sō′mīt′)
n.
1. Any of the homologous segments that compose the body of certain animals, such as earthworms and lobsters, and are arranged in a longitudinal series.
2. A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae.

so·mit′ic (sō-mĭt′ĭk) adj.

so·mite

(sō'mīt)
One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction until 42 pairs are formed; their presence is considered evidence that metameric segmentation is a vertebrate characteristic.
[G. sōma, body, + -ite]

somite

or

metamere

a serial segment of the animal body. see METAMERIC SEGMENTATION.

so·mite

(sō'mīt)
One of the paired, metamerically arranged cell masses formed in early embryonic paraxial mesoderm; develop in a caudal direction typically until 42 pairs are formed.
[G. sōma, body, + -ite]
References in periodicals archive ?
When Shh is synthesized by the notochordal cells, it not only controls cell fate of neurons in the neural tube, ventral location so that they can be identified as motor neurons, but also participates in determining the sclerotome and pattern formation of somites (Bumcrot & McMahon, 1995; Munsterberg & Lassar, 2005; Lassar & Munsterberg, 1996).
In addition to these target tissues, we demonstrate for the first time that muscle (somite and cranial), heart, and many ganglion cells also respond to estrogen exposure, thus activating the estrogen signaling cascade in these cells.
The focus of this manuscript is to present an alternative to windowing for somite cross-transplantation or somatic tissue cross-transplantation studies.
6, G and H): One lateral spine on 5th and 6th abdominal somites, one dorsomedian spine and one pair of lateroventral spines on 6th abdominal somite.
3a); males of this genus, and those of Fabia share long swimming setae on external face of carpus and propodus of P3 and P4, and two or more abdominal somites fused (Figs.
Abdomen dorsally carinated on all somites, except on somite 1; somites 3 to 6 with posteromesial tooth, the one of somite 3 distinctly strong.
The abdomen (in dorsal view) has five abdominal somites that are freely articulated, with a lateroterminal spine at the right distal portion of the fifth segment with undeveloped appendages and the telson (Fig.
L/W of the P4ENP3 is about 1-5-1.7, serration of urosomal dorsal frills is almost equally coarse on the second through fourth somites H.
Moreover, skeletal myocytes originate from precursors in the somite that also give rise to adipocytes.
Pathogenesis of the disorder likely involves various dominant and recessive genetic mutations including GDF6, GDF3, MEOX1, and RIPPLY2 which are responsible for transcription regulation and signaling pathways involved in somite development during embryogenesis [7-12].