sperm morphology

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Related to sperm morphology: sperm count, sperm motility

sperm morphology

A parameter assessed in semen analysis: according to WHO criteria, a sample is regarded as normal if 4% or more of the sperm are morphologically normal.


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 ?
97%) sperm morphology using MSOME after vitrification (Table 2).
2014) observed a partial recovery in plasma membrane integrity and sperm morphology, directly related to the control of lipid peroxidation, hydrogen peroxide and nitric oxide production.
Group 2: Normozoospermics (20 cases) persons with sperm concentration of 20 million/mL or more, sperm motility of 50% or more (a + b type motility), normal sperm morphology of 30% or more.
This study was to describe the morphological characteristics of partial globozoospermia and to demonstrate if there is any correlation between ICSI fertilization rate and the sperm morphology in patients with partial globozoospermia.
These exploratory findings suggest some deleterious differences in sperm morphology (e.
Agglutination, concentration, motility (progressive--PR, non-progressive --NP, immotile--IM), sperm morphology were assessed in accordance with the WHO 5th edition recommendations ("WHO laboratory manual for the examination and processing of human semen", 2010).
The researchers sought to determine common lifestyle factors that may be associated with poor sperm morphology.
Reliable data about sperm morphology was only available for 1,970 men and so the researchers compared the information collected for 318 men who produced sperm of which less than four per cent was the correct size and shape and a control group of 1,652 men where this was above four per cent and therefore considered 'normal' by current medical definitions.