Sperm density is the number of sperm that are present per milliliter cc of semen. Sperm density is typically reported in units of millions of sperm per cc. However, using the total motile count TMC is arguably an even better way of judging male fertility potential. Oligospermia : any sperm density less than what is considered normal.
Density, Motility, and Total Motile Count — MaleInfertilityGuide
Spermatozoa, after passage through the epididymis, are motile cells. Sperm motility becomes critical at the time of fertilization because it allows or at least facilitates passage of the sperm through the zona pellucida. Without technologic intervention, a non-motile or abnormally-motile sperm is not going to fertilize. Hence, assessing the fraction of a sperm population that is motile is perhaps the most widely-used measure of semen quality. In evaluating motility with most species, sperm are classified as non-motile, progressively motile or non-progressively motile. A progressively motile sperm swims forward in an essentially straight line, whereas a non-progressively motile sperm swims, but with an abnormal path, such as in tight circles.
Sperm Density, Motility, and Total Motile Count
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Click on image for details. Sperm motility and morphology as changing parameters linked to sperm count variations. Variations in semen analyses of males over a 1 year period were assessed. Positive relationships between a falling sperm count, a decrease in motility and total motile counts were seen. Also, increasingly, abnormal forms were found with lower sperm counts.