1985
DOI: 10.1002/jmor.1051840105
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Scanning electron microscope studies on blastodisc formation in the zebrafish, Brachydanio rerio

Abstract: Upon fertilization, the zebrafish egg undergoes marked physiological and structural changes, one of which involves blastodisc formation. Before fertilization, yolk globules are rounded and the endoplasm extends throughout the oocyte. During blastodisc formation, the yolk globules become angular and the endoplasm is restricted to streamers among the yolk globules. The streamers are oriented in an anterior-posterior axis of the egg. During blastodisc formation the cytoskeleton consists of an extensive array of f… Show more

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Cited by 35 publications
(32 citation statements)
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“…This is achieved via a process known as ooplasmic segregation, where ooplasm is separated from the yolk and accumulates at the animal pole (AP) to form a blastodisc. (26) Via subsequent meroblastic cleavages, the blastodisc divides atop of the non-dividing yolk cell, and it is from these cells that the embryo is derived. Thus, ooplasmic segregation is the first major pattern-forming process following egg activation.…”
Section: Calcium Signalling During the Zygote Periodmentioning
confidence: 99%
“…This is achieved via a process known as ooplasmic segregation, where ooplasm is separated from the yolk and accumulates at the animal pole (AP) to form a blastodisc. (26) Via subsequent meroblastic cleavages, the blastodisc divides atop of the non-dividing yolk cell, and it is from these cells that the embryo is derived. Thus, ooplasmic segregation is the first major pattern-forming process following egg activation.…”
Section: Calcium Signalling During the Zygote Periodmentioning
confidence: 99%
“…One of the major events during egg activation is ooplasmic streaming, which causes the segregation of the ooplasm away from the vegetal yolk mass and toward the animal pole of the egg (Hisaoka and Firlit, 1960;Beams et al, 1985). This movement results in the lifting of the first cell, or blastodisc, at the animal pole (Fig.…”
Section: Mutations Affecting Egg Activationmentioning
confidence: 99%
“…The development of the blastula has been documented by scanning electron microscopy (Beams et al 1985). The timing of developmental stages noted in this review will be for embryos grown at 28.5°C (Westerfield 1989).…”
Section: Cleavagementioning
confidence: 99%