neurula


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neurula

 [noor´oo-lah]
the early embryonic stage following the gastrula, marked by the first appearance of the nervous system.

neu·ru·la

, pl.

neu·ru·lae

(nū'rū-lă, -lē),
Stage in embryonic development in which the prominent processes are the formation of the neural plate and the plate's closure to form the neural tube.
[neur- + L. -ulus, small one]

neurula

(no͝or′ə-lə, -yə-lə, nyo͝or′-)
n. pl. neuru·las or neuru·lae (-lē)
An embryo at an early stage of development in which neurulation begins.

neu·ru·la

, pl. neurulae (nūr'yū-lă, -lē)
Stage in embryonic development during which the neural plate forms and closes to form the neural tube.
[neur- + L. -ulus, small one]

neurula

the stage of a vertebrate embryo when gastrulation is largely finished and a neural plate is forming, ending with the formation of the neural tube.
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References in periodicals archive ?
The results revealed that Sox5 transcript was detected at very low levels in embryos at early stages up to the gastrula, but was then upregulated and reached peak expression in the neurula stage, and then was slightly downregulated between tail-bud and hatching.
Patterns of gene expression suggest that initial left-right asymmetry is established at the late gastrula/early neurula by nodal expression in anterior somites on the left and later in endoderm on the left together with the expression of the nodal antagonist, lefty, on the right (Yu et al., 2002; Onai et al, 2010, 2012).
A twofold destructive/proliferative action of injury itself is fundamental in the organizative phenomena during the late blastula, gastrula and neurula stages, as shown in the Bufo arenarum species when specimens are submitted to experimental exogenous injury.
Further studies will compare the effects of both all-trans and 9-cis retinoic acid on early neurula killifish embryos.
Table 1 Schedule for development of Asymmetron lucayanum at 27[degrees]C, with notes on embryonic and larval behavior Stage Time after Figure fertilization 1- and 2-cell 1 h 5A-C 4- and 8-cell 2 h 5D 16- and 32-cell 3 h not shown 64- and 128-cell 4 h not shown Blastula 5 h 5E Mid gastrula 9 h 5F Late gastrula (a) 12 h 5G-I (b) Just-hatched neurula 15 h 5J-L Early neurula 19 h 5M, N Mid neurula (c) 24 h 5O Late neurula (d) 32 h 5P, Q Hatchet-shaped embryo (d), (c) 50 h 5R-Y Early larva (mouth just open) (f) 3 days 5Z-Z"; 6A-F Feeding larva 5 days 6G-Q (a) Newly produced ectodermal cilia cause embryo to rotate in fertilization envelope.
Electron microscopic study of the development of amphioxus Branchiostoma belcheri tsingtauense: the neurula and larva.
Six plasmid cDNA libraries were prepared for EST sequencing, two from mixed blastual and gstrula stages, two from mixed late gastrula and neurula stages, and two from juvfeniles with 2-3 gill slits.
Furthermore, homologs of neural plate border specifiers Msx, Zic, and Pax3/7 are present within the neural plate border territory in late gastrula/early neurula, suggesting that the initial steps of the border patterning and specification are already present in cephalochordates (Holland et al., 1999; Sharman et al., 1999; Gostling and Shimeld, 2003).
The search identified numerous clones of GFP from unfertilized egg, gastrula, neurula, larval, and adult libraries for B.
Cell-lineage of the larval nervous system in the ascidian Ciona intestinalis: neurula stage through to hatched larva.
These genes are initially expressed in the involuting mesoderm of the gastrula, then in the differentiating somites of the neurula, followed by the differentiating notochord and finally in the tail bud of the 10-somite stage embryo (15).
Retinoic acid modifies the pattern of cell differentiation in the central nervous system of neurula stage Xenopus embryos.