blastopore


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Related to blastopore: archenteron
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  • noun

Words related to blastopore

the opening into the archenteron

References in periodicals archive ?
The blastodic became apparent on day 28 and the blastopore was visible on some eggs (Fig.
The blastopore and archenteron were visible in the diminished vegetal half of chlorpyrifos-treated larvae.
erythrogramma, the movement and destination of cells as they travel over the blastopore lip and into the archenteron differ from typical feeding larval development (Wray and Raff 1991a).
The early stage comprised eggs from fertilization to blastopore closure, with the embryo not visible in preserved eggs (Ahlstrom and Moser, 1980).
Stage 2: gastrulation, cellular organization, and differentiation are evident; first embryonic membrane is ruptured as the embryo becomes asymmetrical; blastopore can be discerned
The resulting blastopore started as a wide pit, subsequently deepening into the archenteron (Fig.
Eggs were then binned into three broader categories that comprised 1) early-stage eggs (E: stages 1-12), which includes all stages before the closing of the blastopore; 2) middle-stage eggs (M: stages 13-15), when the blastopore is closed, the margin of the tail is defined, and the tail bud is thick, but the margin remains attached to the yolk; and 3) late-stage eggs (L: 16-23), when the tail lifts away from yolk and lengthens and encircles the top half of the yolk to extend just beyond the head of the embryo.
The endogenous EFs, measured beneath the epidermal epithelium, increase in magnitude near the blastopore, averaging 27 mV/mm between a point near the blastopore and a point 400-600 pm rostral and 40 mV/mm between a point near the blastopore and a point 250 pm dorsal at the caudal region of the embryo (Hotary and Robinson, 1994).
The blastopore closed on day 15 when the germ ring completely enveloped the yolk.
It is worth mentioning here that the primary blastopore does not close in the holothurian Cucumaria japonica and becomes the anus of the adult animal (Mashanov and Dolmatov, 2000).
The zoanthella larva (named by van Beneden, 1897) was first described by Semper (1867); this larva is an almost cylindrical planula that has a long, mid-central ciliary band extending from the blastopore to the anterior pole.
The blastopore remains open throughout gastrulation and is situated initially in the center of the vegetal pole of the embryo (Fig.
As the blastopore closes, the immunoreactive cells are localized to the stomadeum cells that give rise to the foregut structures such as the mouth and anterior region of the esophagus, as shown in C.