sperm capacitation


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sperm capacitation

Changes in spermatozoa, occurring in the female reproductive tract, that make them potentially capable of fertilization of an ovum.

sperm

the male germ cell. See also spermatozoon.

sperm agglutinins
anti-sperm antibodies of the IgG class occur as autoantibodies in dogs infected with Brucella canis.
sperm capacitation
acquisition of the capacity to penetrate an ovum, not present at the time of delivery of the spermatozoon, and which requires a period of incubation in the female tract. It involves increased metabolic activity and motility and the removal of a chemical decapacitation factor from the spermatozoon. Capacitation must take place for the acrosome reaction to occur.
sperm concentration
a sperm count as measured in a hemocytometer; an indication of the health of the relevant testicles and a guide to the prospective fertility of the ejaculate and the donor.
sperm live-dead ratio
an indicator of the viability of the ejaculate as expressed in a slide count of a specially stained smear of the semen in which the dead and live sperm can be distinguished because of their differential staining.
sperm morphology
the normal anatomical structure of the spermatozoon. Abnormality of the structure of individual spermatozoa is used as a guide to the location and nature of the disease causing reduced reproductive efficiency.
Enlarge picture
Morphology of normal and abnormal canine spermatozoa. By permission from Nelson RW, Couto CG, Small Animal Internal Medicine, Mosby, 2003
sperm motility
the percentage of spermatozoa moving actively forward. Assessed under the microscope (400 × magnification) or by computerized imaging. See also wave motion; used to predict the probable fertility of the ejaculate.
sperm motility index
half the sum of the sample's sperm percentage motility + sperm progressive motility.
sperm penetration assay
see ovum penetration assay.
sperm stone
hard bodies composed of inspissated masses of spermatozoa found in dilated remnants of epididymal ducts and produced by chronic epididymitis.
sperm transport
within both male and female reproductive tracts some movement forward results from the movements of the spermatozoa but most progress is the result of peristaltic movements by the tubular organs in which the spermatozoa find themselves at the time.
References in periodicals archive ?
Effect of seminal phospholipid-binding proteins and follicular fluid on bovine sperm capacitation.
The present study results are consistent with those of previous studies indicating that a limited amount of ROS can trigger the sperm capacitation process [11-13].
Sperm capacitation removes the outer layer around the sperm, helps it travel to the fallopian tube, and allows the sperm to penetrate and fertilize the egg.
Tissue specific PKA inhibition using a chemical genetic approach and its application to studies on sperm capacitation.
The bishops must, at some level, understand this science, since they support the use of medications that "prevent ovulation, sperm capacitation, or fertilization" on women who are victims of sexualized violence.
Conditions influencing human sperm capacitation and penetration of zona-free hamster ova.
If phosphorylation on a particular amino acid is absolutely required for sperm capacitation, a drug could be developed which prevents phosphorylation from occurring at that specific site, thereby preventing the entire capacitation process," says Platt, adding that this turning off of the phosphorylation switch could then prevent fertilization entirely.
Perhaps the most significant discovery has been the participation of heparin-binding proteins (HBPs) in the sperm capacitation (THERIEN et al.
To assess the treatment effect on acrosome status and sperm capacitation dynamics, CTC stain was performed to the corresponding treatment group along with its control.
Each type of ASAB may interfere directly or indirectly with a different step in the fertilization process, including sperm motility, sperm penetration of the cervical mucus, sperm capacitation and the acrosome reaction, sperm binding and penetration of the zona pellucida, zona reaction, gamete fusion, cleavage, and embryo development.
Taken within 72 hours of unprotected sex, EC can inhibit ovulation; inhibit the migration of the sperm into the fallopian tube, where fertilization usually occurs; or interfere with sperm capacitation, the process by which sperm becomes capable of fertilizing an egg.
The directive states, "If, after appropriate testing, there is no evidence that conception has occurred already, she may be treated with medications that would prevent ovulation, sperm capacitation or fertilization.