polar body


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po·lar bod·y

one of two small cells formed by the first and second meiotic division of oocytes; the first is usually released just before ovulation, the second not until discharge of the oocyte from the ovary; in mammals, the second polar body may fail to form unless the oocyte has been penetrated by a sperm.

polar body

n.
Either of two small cells produced during the first and second meiotic divisions in the development of an oocyte, containing little cytoplasm and eventually degenerating.

polar body

one of the small cells produced during the two meiotic divisions in the maturation of a female gamete, or ovum. Polar bodies are nonfunctional and incapable of being fertilized. See also oogenesis.

po·lar bod·y

(pō'lăr bod'ē)
One of two small cells formed by the first and second meiotic division of oocytes; the first is usually released just before ovulation, the second not until discharge of the oocyte from the ovary.
References in periodicals archive ?
Polar body formation in Spisula oocytes: function of the peripheral aster.
Effects of taxifolin during oocyte IVM on the frequency of first polar body extrusion (nuclear maturation) Concentration Oocytes (n) Oocytes with Polar body ([micro]g/mL) polar body extrusion rate extrusion (n) (% [+ or -] SEM) 0 (Control) 181 146 80.
Note added in proof: Evidence for RhoA involvement in establishing the polar body F-actin ring in Xenopus, as well as somatic contractile rings in echinoderms, is provided in a new paper by Bement et al.
In the short term, the IVF patients most likely to benefit from preimplantation screening by polar body CGH are those of an older maternal age (over 37 years), those with a record of unsuccessful IVF, and those with a history of miscarriage; all these conditions are associated with a higher than average rate of embryonic chromosomal abnormality.
The Mos/mitogen-activated protein kinase (MAPK) pathway regulates the size and degradation of the first polar body in maturing mouse oocytes.
Demecolcine-induced oocyte enucleation for somatic cell cloning: coordination between cell-cycle egress, kinetics of cortical cytoskeletal interactions, and second polar body extrusion.
Pronuclear formation and polar body formation were determined using the 45-min time points, whereas cleavage was determined at 90 min time points.
The first polar body and the metaphase plate of an oocyte were drawn into an enucleation pipette (20 to 22 [micro]m i.
1d, d') was the region through which the polar body nucleus and associated remaining centrosomal material passed (~22-24 rain post-activation; Fig.
Because both cardiovascular exercise and strength training are essential to a balanced workout, the Polar F55 gives the modern fitness enthusiast a complete exercise session by adding new features like Polar Body Workout, a muscular strength-training guide.
Triploids were produced by inhibiting the release of second polar body (PBII) with a treatment of 450 gmol/mL 6-deimethylaminopurine (6-DMAP), with untreated fertilized eggs developing as normal diploid controls.