blastoderm


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Related to blastoderm: blastodisc, area pellucida, Hensen's node

blastoderm

[′blas·tə‚dərm]
(embryology)
The blastodisk of a fully formed vertebrate blastula.
References in periodicals archive ?
66%) did not hatch and when broken on day 22 they were found to be macerated early vascularised blastoderms.
5 h Eight-cell embryos 9 h 16-cell embryos 23 h Unhatched blastulae; wrinkled with a clear blastocoel and irregular blastoderm 47 h * Hatched blastulae; apical tuft visible 73 h Initiation of gastrulation 4 days Mid-stage gastrulae; archenteron about 1/2 way into blastocoel 7 days Gastrulae that are compressed; first spicules visible with cross-polarized light 8 days Prisms 14 days Two-arm plutei with open mouths 33 days Four and six-arm plutei 48 days Formation of lobes begins 79 days Juvenile rudiments with podial buds and pedicellariae 120 days Metamorphosis; juvenile spine count ranges from 5 to 23 * Blastulae were unhatched at 23 and 33 h.
1999), causing the blastoderm to move closer to egg shell resulting in early embryonic death from dehydration (Brake et al.
erythrogramma in detail, and they suggested that these embryos develop wrinkles in part because the fertilization envelope fits tightly over large, yolky eggs and leaves little room for the expanding blastoderm.
Moreover, before laying, the embryo blastoderm starts to differentiate, as eggs remain at room temperature after laying is complete, embryos cease to develop further, and this stage is characterized by the formation of zona pellucida.
Microtubules and mitotic cycle phase modulate spatiotemporal distributions of F-actin and myosin II in Drosophila syncytial blastoderm embryos.
Traditional eggshell windowing has proven to be a powerful tool for preparing and processing host embryos for developmental biology experiments as well as to provide an access point to deliver a viral vector to the blastoderm for generating transgenic chickens (Speksnijder and Ivarie, 2000; Andacht et al.
To determine whether a similar signaling mechanism is present in the long-finned squid, Loligo pealei, early cleavage stages and blastoderm stage embryos were studied by immunocytochemistry.
These waves arise every 5 to 10 min from a variety of locations and traverse the blastoderm margin and main body axis (1).
In the first session, images were collected at 5-min intervals, front first cleavage through blastoderm formation; three of these images are presented in Fig.
In contrast to many arthropods, horseshoe crabs retain significant numbers of yolk nuclei after cellular blastoderm formation (Kishinouye, 1893; Kingsley, 1892, 1893; Kimble et al.