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 ?
After that, 50|l containing the sperm pellet was washed in 300 [micro]l of Hepes-SOF at 300 xg during 3 min.
Subsequently, the supernatant was removed and the sperm pellet was gently overlaid with 300 [micro]l of Hepes-SOF in 45[degrees] inclination angle.
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.
All sperm head measurements were clustered by length, width, area, perimeter using iterative k-means cluster analysis to classify spermatozoa into a reduced number of subpopulation according to their head dimensions and then a step-wise discriminant analysis of the clusters was obtained [36].
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.
Motile sperm fraction was diluted with Ham's F10 medium supplemented with 5% human serum albumin (HSA) to reach final concentration of 20x[10.
A sperm (bottom), at the same magnification, is from Drosophila bifurca.
Sperm with their associated secretions in HEPES-KOH buffer were then transferred to 4 cm squares of Parafilm M[R] placed on a wet filter paper bed in a Petri plate (5.
Semen volume, appearance, pH, and viscosity as well as sperm concentration, motility, and morphology were evaluated after liquefaction based on the guidelines of the World Health Organization (WHO).
In this study, we investigated the fertilization rate of IVF or ICSI in 34 cases that were diagnosed with partial globozoospermia according to the criteria of more than 25% round-headed sperm in the ejaculate.
The sperm was collected (without hormonal induction) in plastic graduated syringes (1 mL) that were placed on the urogenital papilla while applying gentle abdominal pressure until the first sign of blood.