sperm

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Related to sperm motility: sperm count, sperm morphology

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 ?
Sperm motility in teleosts can be evaluated using a number of methods as follows: ratio of motile sperm, moving speed, and motile duration.
Since hyperactivation is a flagella phenomenon, it is possible to visually assess hyperactivation based on sperm motility; flagella movement patterns were evaluated for the enumeration of nonhyperactivated and hyperactivated sperm [17].
Tam et al., "Comparison of glycolysis and oxidative phosphorylation as energy sources for mammalian sperm motility, using the combination of fluorescence imaging, laser tweezers, and real-time automated tracking and trapping," Journal of Cellular Physiology, vol.
Results of this section showed that the sperm motility, progressive motility and vitality were significantly improved (P < 0.05) in both control and treated groups with (yeast extraction, YE) compared to preactivation groups (Table 1 and fig 4,5 and 6), while there were no significant differences in the assessment values among YE (Table 1).
Maximum duration of sperm motility recorded at 12 and 24 h was observed for the WiC group, which probably was related to the fact that spotted sand bass males were captured during breeding season (February-July) (Ocampo, 2002).
Group III showed a significant decrease in sperm motility (P < 0.001) as compared with the control Group I.
Because of the importance of fluid transport and efficient cell volume regulation during germ cell development and sperm motility, the potential role of cellular membrane channels such as aquaporin water channels has received particular consideration.
The sperm motility rate and motility time of lane snapper with the use of extender C (pH 8.2) were significantly higher (P <0.05) in comparison with other extenders (Table 2).
The 8[per thousand] treatment was not able to start sperm motility, however it was verified that sperm became motile when further exposed to the 2[per thousand] media; activation occurred and mean motility time was 75s.
A comparison of data on sperm motility at the top and the bottom layers after sexing, cooling and freezing processes is presentedin Table 1.
The sperm motility parameters were as follows: PR 19.70 [+ or -] 2.26%, NP 21.10 [+ or -] 2.30%, and IM 59.10 [+ or -] 2.61%.