polar body


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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

n
(Biology) physiol a tiny cell containing little cytoplasm that is produced with the ovum during oogenesis when the oocyte undergoes meiosis

po′lar bod′y


n.
one of the minute cells arising from the unequal meiotic divisions of the ovum at or near the time of fertilization.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.polar body - a small cell containing little cytoplasm that is produced along with the oocyte and later discarded
cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
References in periodicals archive ?
Moreover, a small cell known as a polar body grew to an unusually large size during the process, which could indicate developmental abnormalities.
In the water temperature experiment, the highest percentage of oocytes without a polar body (PB) occurred at 19[degrees]C, indicating delayed meiotic development, with a nondevelopment rate of 75.
Oocytes were enucleated by aspirating the polar body and MII chromosomes in a small amount of cytoplasm using an 18-pm beveled glass pipette (Origio, Charlottesville, VA, USA).
The formation of the first polar body was observed in the early of 3 minutes after fertilization occurred.
This system must be suitable for the implementation of ICSI, and other treatments, such as polar body biopsy, Trophektodermbiopsie, laser-assisted hatching.
They also cover pathology, including omics for oocyte selection, alterations in gene expression, transgenerational risks by exposure in utero, obesity and oocyte quality, the safety of ovarian stimulation, epigenetics, and the genetic basis for primary ovarian insufficiency, and technology and clinical medicine, with discussion of polar body screening for aneuploidy and transplantation of ovarian tissue or immature oocytes to preserve and restore fertility.
Only MII oocytes with extruded first polar body were micro-injected.
During the first meiotic division, cell cleavage is unequal in that one daughter cell retains most of the cytoplasm (this large cell is now often referred to as the egg), with the other daughter cell retaining very little (this small cell is referred to as the first polar body and may not undergo the second meiotic division) (Figure 1B).
Parthenogenesis occurs when an egg or ovum fuses with a cell called a sister polar body, a byproduct of ova production, rather than with male sperm, to promote cell division.
Dr Fishel, a former pupil of King David School, Childwall, said: "We are delighted to announce the world's first pregnancy using real-time polar body array Comparative Genomic Hybridization (CGH) and the baby is due later in the spring.
Dr Fishel said: "We are delighted to announce the world's first pregnancy using real time polar body array Comparative Genomic Hybridization (CGH) and the baby is due later in the spring.
His students did continue their studies of polar body formation in Spisula; he did mentor them; and they did submit a publishable paper to this journal.