perivitelline space


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per·i·vi·tel·line space

the space between the vitelline membrane and the zona pellucida, appearing in an ovum immediately following fertilization.

perivitelline space

the space between a mammalian ovum and the zona pellucida, into which the polar bodies are released at the time of maturation. In some animals it is a fluid-filled space that separates the fertilization membrane from the vitelline membrane surrounding the ovum after the penetration of a spermatozoon.
References in periodicals archive ?
Hesla's group first placed rabbit eggs in a sugar solution to enlarge the perivitelline space.
On fertilization, these granules opened onto the cell surface and discharged the contents into the perivitelline space (Fig.
Nature of the perivitelline space in sea urchin eggs.
The relative widths of the embryo, envelopes, layers, and perivitelline space are not drawn to scale.
In some eggs, the HE remained close to the egg surface so that the perivitelline space was obscured (not shown).
Granular material similar to that in control eggs was visible in the perivitelline space.
The space between the blastomeres communicates with the perivitelline space [ILLUSTRATION FOR FIGURE 4C OMITTED].
As early as the onset of invagination, cells emerge from the thinner part of the epithelium and enter the perivitelline space at the animal pole [ILLUSTRATION FOR FIGURE 5B OMITTED].
The main characteristics of this development are (1) incomplete cleavage that becomes holoblastic; (2) external migration of mesenchyme cells, in the perivitelline space, from the animal to the vegetal pole during gastrulation; (3) hatching that occurs at the end of the gastrulation; (4) differentiation of the vestibule as soon as the end of gastrulation is attained; and (5) production of a juvenile directly from the gastrula without any larval stage.
The presence of a few test cells within the perivitelline space of M.