somite

(redirected from Somites)
Also found in: Dictionary, Thesaurus, Encyclopedia.

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 ?
A number of signaling molecules have been characterized to play critical roles for specification and differentiation from the somite to the myotomes [12,13].
bipunctatus has a long dactylus inserted disto-medially on ventral margin of propodus and overreaching the tip of this latter article, and a subtriangular telson, laterally expanded, which is wider than the sixth somite (Figs.
Whereas mRNA of all four genes was restricted to the entire CNS, only Cdc25A and Cdc25B had weak staining in somites. All of them were confined to an identical region, neural tube, neural groove and caudal neural plate, corresponding to the future notochord or spinal cord.
Tapscott, " Apoptosis of epaxial myotome in Danforth's short-tail (Sd) mice in somites that form following notochord degeneration," Developmental Biology, vol.
Higher exposure concentrations resulted in progressively higher GFP expression levels, and a nominal concentration of [EE.sub.2] (10 ng/L; measured concentration, 7.25 ng/L) induced considerable expression throughout the liver; this was accompanied by GFP expression in the muscle (somite and cranial muscle) and heart (Figure 3D).
The blue filter facilitates visualization of the somites in the embryo, while it is still in the egg (Giamario et al., 2003).
(1) The vertebral column is derived from the sclerotomes of somites. (2) The fusion of two or more vertebrae is a congenital anomaly of vertebral column may occur in the cervical, thoracic & lumbar.
Females of both genera share an asymmetrical pair of pereopods 3 (walking legs 2), longer than the others, and males possess two or more abdominal somites fused (Campos, 1993, 1996).
In lancelet adults, the preoral hood extends anteriorly from the right metapleural fold, and the right series of somites develop half a segment posterior to the left series (Schubert et al., 2001).
3A): Six thoracic and one free abdominal somites; unsegmented abdomen with forked telson.
MTG16 was found to activate Vegfa expression in somites, demonstrating an additional non-cell-autonomic effect of this important corepressor [82].
Shh is a gene involved in different processes of embryonic development, as the induction of the neural tube, differentiation of the somites, and regionalization of the intestine (Sadler, 2012), it is also related to a center of signals involved in the anteroposterior formation members design (Johnson et al., 1994; Antonelli et al., 2012).