Noun
The single aster formation that forms at the equatorial plate at the end of metaphase in mitosis.
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After the encounter of the two pronuclei, one quadrant of the former positive cross of the monaster is missing on the side of the egg pronucleus.
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One finds the longest chromosomes in the vascular epithelial cells if the monaster is well developed (Fig. 24), whilst shortly beforehand (Fig. 15) the chromosomes are still rather short.
At the same time the middle piece breaks down and releases the centriole, around which egg cytoplasm forms the sperm monaster.
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Large monasters can be produced in egg cells by a variety of methods; drugs, such as strychnine or chloral hydrate (Hertwig, 1887 ), hypertonic sea water (Morgan, 1896; Wilson,1901;Herlant, 1918),and by mechanical agitation (Boveri, 1903; Painter, 1915).