blastula


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Related to blastula: gastrulation, archenteron

blas·tu·la

 (blăs′chə-lə)
n. pl. blas·tu·las or blas·tu·lae (-lē′)
An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Also called blastosphere.

[New Latin : from Greek blastos, bud + Latin -ula, feminine diminutive suff.]

blas′tu·lar adj.
blas′tu·la′tion (-lā′shən) n.

blastula

(ˈblæstjʊlə)
n, pl -las or -lae (-liː)
(Biology) an early form of an animal embryo that develops from a morula, consisting of a sphere of cells with a central cavity. Also called: blastosphere
[C19: New Latin; see blasto-]
ˈblastular adj

blas•tu•la

(ˈblæs tʃə lə)

n., pl. -las, -lae (-ˌli)
the early developmental stage of an animal, following the morula stage and consisting of a single spherical layer of cells enclosing a hollow, central cavity. Compare blastocyst.
[1885–90; < Greek blast(ós) bud, sprout + New Latin -ula -ule]
blas′tu•lar, adj.
blas`tu•la′tion (-ˈleɪ ʃən) n.

blas·tu·la

(blăs′chə-lə)
Plural blastulas or blastulae (blăs′chə-lē′)
An embryo at the stage immediately following the division of the fertilized egg cell, consisting of a ball-shaped layer of cells around a fluid-filled cavity. Compare gastrula.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.blastula - early stage of an embryo produced by cleavage of an ovumblastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
conceptus, fertilized egg, embryo - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity - the fluid-filled cavity inside a blastula
blastocyst, blastodermic vessicle - the blastula of a placental mammal in which some differentiation of cells has occurred
trophoblast - the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
Translations

blas·tu·la

n. blástula, etapa primitiva del óvulo.
References in periodicals archive ?
In this species, sex determination/differentiation of genes as dmrt2 (doublesex/mab-3 related family of transcription factors) has been characterized and found to be highly expressed at key developmental stages as blastula and during male gonad maturation (Shi et al.
Continuous cleavage led to a blastula at 280 minutes after fertilisation (Fig.
Blastula stage started from fourth hour to twentieth hour after post fertilization, categorized with two separate layers of the blastoderm, an external enveloping coating and a supplementary yolk syncytial layer.
After fertilization process the eggs develop into 2-cell, 4-cell, 8-cell, 16-cell stages and so on until a blastula stage (128-cell stage) is formed (Sewel and Young, 1999).
Critics of the research argue that using blastulas destroys what is technically an unborn child, while proponents say that a blastula is not yet a child.
Se presento un desarrollo de blastula temprana donde el blastodisco adopto una forma ovalada diferenciando dos polos, por lo cual se reconocio que los huevos eran del tipo telolecitico, ya que acumulan vitelo en el polo vegetal de los mismos y presentan una division parcial o meroblastica durante los primeros estadios del desarrollo, con un EPV=93 [micron]m; ab=512 [micron]m, AV=592 [micron]m y LV=490 [micron]m (Figuras 3 y 4).
By about day 50, the blastula formed, and individual cells were no longer discernible.
1995), clasificando los periodos del embrion como zigoto, clivaje, blastula, gastrula, segmentacion, faringula y eclosion, para llegar a la fase de larva.
5hr Blastula 3-5hr Gastrula Trochophore 16-18hr -- -- D-shaped 63-77 D1-5 64-84 26hr Umbo 74-251 D5-12 90-110 -- Eye-spot 144-267 D 12-16 -- -- Pediveliger 195-350 D12-16 274 -- Spat 490> D16> -- -- Stage Pernaviridis [13] Ensisarcuatus [17] Size Time Size Time ([micro]m) ([micro]m) 1st pb 50-60 20m 60 15m 2nd pb 2 to 32-cell 40m 6h Morula 60 >6hr Blastula 6-12h Gastrula 16h Trochophore -- -- -- 19h D-shaped 60-70 24hr 109 20-24 Umbo 90-260 D7 177 D7 Eye-spot 220-270 D13 -- -- Pediveliger 280-380 D16 283 D14 Spat 400-490 >D21 378 D20 Stage Placuna placenta [18] Size Time ([micro]m) 1st pb 50-70 15m 2nd pb 20m 2 to 32-cell 155m Morula 285 Blastula 295 Gastrula 305 Trochophore 341 D-shaped 80 18 Umbo 140 D4 Eye-spot -- -- Pediveliger 215 D7 Spat 340 D10
Horas Estado de desarrollo post-fertilizacion (HPF) 0:15-0:30 division de 2 y 4 celulas 0:45-0:55 8 celulas 1:10-1:30 16 celulas 1:40-1:50 morula 4:15-4:25 blastula 6:15-6:25 inicio del eje embrionario 7:15-7:25 evolucion del embrion 8:15-8:25 segmentacion del embrion 10:19 continua segmentacion hasta la cola y aparecen pigmentos 15:39 formacion de la aleta caudal y aparicion de organos internos 16:44 empieza a latir el corazon y se observa movimiento del embrion 19:49 eclosion del embrion