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 ?
Toluidine blue stained sperm heads were evaluated using the morphometry module of a commercially available system (Sperm-Class Analyzer[R], Microptic, Barcelona, Spain).
The system only detected the boundary of sperm heads and their outlines were displayed as white overlays superimposed on the video image and four measurements of sperm heads were obtained (length in [micro]m, width in [micro]m, area in [micro][m.
In other words, the adjustment of sperm velocity altered male reproductive success and therefore fitness," Bartlett added.
Furthermore, recent studies have also linked lower sperm counts with male health problems, including a number of illnesses and even premature death.
However, only few studies attempted to characterize the sperm abnormalities associated with sperm head vacuoles after cryopreservation.
Males with longer sperm deliver fewer sperm--just a few dozen to a few hundred per mating.
Considering the increase in intracellular calcium due to cell membrane damage in FT sperm (6,32) and with respect to the beneficial effects of antioxidants on these sperm, (7,16,17,20) we sought to examine the simultaneous effect of Trolox as an antioxidant and EDTA as a calcium chelator on FT sperm.
However, there are different proportion of acrosomeless sperm and even different proportion of morphologically normal sperm in partial globozoospermia.
synagris cryopreserved sperm, and to propose a protocol for the cryopreservation of lane snapper sperm that could be applied to marine aquaculture.