sperm

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sperm

or

spermatozoon

(spûr'mətəzō`ən, –zō`ŏn), in biology, the male gamete (sex cell), corresponding to the female ovumovum
, in biology, specialized plant or animal sex cell, also called the egg, or egg cell. It is the female sex cell, or female gamete; the male gamete is the sperm. The study of the ovum is included in the science of embryology.
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 in organisms that reproduce sexually. In higher animals the sperm is produced in the testis of the male; it is much smaller than the ovum and consists primarily of a head, whose nucleus bears the hereditary material (see chromosomechromosome
, structural carrier of hereditary characteristics, found in the nucleus of every cell and so named for its readiness to absorb dyes. The term chromosome
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) of the male parent, and a slender whiplike process (flagellum), which provides the motility necessary for fertilizationfertilization,
in biology, process in the reproduction of both plants and animals, involving the union of two unlike sex cells (gametes), the sperm and the ovum, followed by the joining of their nuclei.
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 in a fluid medium. In higher plants the sperm is contained in the pollenpollen,
minute grains, usually yellow in color but occasionally white, brown, red, or purple, borne in the anther sac at the tip of the slender filament of the stamen of a flowering plant or in the male cone of a conifer.
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 grain and is conveyed to the ovum by the pollen tube; in some lower plants (e.g., mosses and ferns) the sperm is actively motile.

Sperm

 

in plants, a nonmotile male sexual cell, or gamete. In higher plants, sperms are nonmotile because they develop inside a pollen tube, which forms upon the germination of a pollen grain (microspore). Fertilization takes place after the pollen tube ruptures upon reaching the female sex organ—the archegonium in gymnosperms or the embryo sac in angiosperms. In gymnosperms a pair of sperms forms as a result of the division of the generative cell. One of the sperms participates in fertilization, and the other dies. Both sperms participate in the fertilization of angiosperms, one fertilizing the ovum, and the other the secondary nucleus of the embryo sac. The male gametes of pteridophytes, bryophytes, and some gymnosperms (including Cycadopsida and ginkgos) are called spermatozoids; they are flagellate and motile.

sperm

[spərm]
(histology)

sperm

1. another name for semen
2. a male reproductive cell; male gamete
References in periodicals archive ?
Because sperm head is composed by chromatin (DNA condensed by protamine proteins), the chromatin integrity, the shape sperm head and the sperm head morphometry should be related, and several studies have been published.
The association between Computer-assisted Sperm Morphometry Analysis (CASMA) and statistical software have allowed cluster the spermatozoa according to morphometric parameters in morphometrically distinct subpopulations [8, 25, 36, 43].
On the other hand, the influx of extracellular calcium into fresh sperm leads to an increase in the production of free radicals in the cell.
The researchers suggested that the longer sperms might be "preferred" by the female through some unknown process.
The 2 main techniques to analyze sperm in a semen sample are optical and electrical detection.
Sperm cells are one of the most stellar and fascinating cells in all species.
Sperm banks are becoming popular for infertile couples and men who are delaying fatherhood and feel that freezing their sperm provides a guarantee of paternity
Washington, Feb 26 (ANI): In a bid to revolutionise in vitro fertilization (IVF) treatment, Brit scientists have developed a new technology, called Raman spectroscopy, to find sperm with healthy, intact DNA for better chances of a healthy embryo.
The giant microscope enlarges photographs of sperm by up to 16,000 times.
Scientists had proposed two other ways sperm might find eggs: by sniffing out chemicals or by sensing temperature gradients.
In birds the situation is more complex, as females store sperm prior to fertilizations in specialized sperm storage tubules (SSTs) at the junction of the uterus and vagina (e.