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 ?
Even more dramatic than this is the demand for "educated sperm".
And Alistair Elfick, a professor at the University of Edinburgh in the United Kingdom, who developed the technique using Raman spectroscopy, said that the DNA, and not the sperm cell itself, is what is really important for a developing embryo.
Abbas said, "The device enlarges photographs of sperm by up to 16,000 times, a gigantic leap from conventional microscopes which are only capable of enlarging images by 400 times."
In a new (https://www.eurekalert.org/pub_releases/2019-07/asfb-smo071819.php) study published in the (http://www.jbc.org/content/early/2019/06/14/jbc.RA119.008729.abstract?sid=05f532e6-1ab8-4412-8491-2b605312130a) Journal of Biological Chemistry , molecular anthropologist Pascal Gagneux suggests how the sperm suppresses the female body's immune response.
Cryopreservation of sperm in liquid nitrogen is the only method for long-term storage, but sperm refrigeration is usually used to preserve animal sperm up to 3-5 days.
Men without sperm make up about 15 per cent of all infertile men in the reproductive age of fatherhood in Nigeria, a study has found.
Intracytoplasmic Sperm Injection (ICSI) as an integral part of assisted reproduction has become increasingly popular in human male patients with certain infertility problems (1).
Mass motility of sperms was made on the basis of an arbitrary scale from 0 to 5.
The moving fluid hands sperm a map to their target, researchers report in the March 18 Current Biology.
Progesterone from the cumulus cells is the sperm chemoattractant secreted by the rabbit oocyte cumulus complex.
The number of papers published about sperm during the years 1897 to 2010 was searched using the keyword sperm through the EndNote software.
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.