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This means that the sperm is produced in the testes but on its way out, it gets misdirected into the bladder rather than coming out through the urethra. This can lead to a low volume of semen (hypospermia) or no semen production . Structural or functional damage to the bladder neck muscle causes the backflow of semen during the ejaculation.
Azoospermia is the medical condition of a man whose semen contains no sperm. [1] It is associated with male infertility, but many forms are amenable to medical treatment.In humans, azoospermia affects about 1% of the male population [2] and may be seen in up to 20% of male infertility situations in Canada.
Subregions within the AZF region are AZFa (sometimes AZF1), AZFb and AZFc (together referred to as AZF2). AZF microdeletions are one of the major causes of male infertility for azoospermia (complete absence of sperm in the ejaculate [3] [4]) and severe oligozoospermia (less than 5 million spermatozoa in the ejaculate [4]) males.
Aspermia is the complete lack of semen with ejaculation (not to be confused with azoospermia, the lack of sperm cells in the semen). It is associated with infertility.. One of the causes of aspermia is retrograde ejaculation, because of that the sperm is kept into the bladder and the final ejaculate is 0 mL. [1]
Low-volume, runny/fluid semen (oligospermia) or no semen at all (dry ejaculation/aspermia) are a logical consequence of an obstruction downstream of the seminal vesicles which contribute most to the volume of the semen. Usually, men will be able to observe a runny/fluid, low-volume semen by themselves during masturbation.
Causes of complete asthenozoospermia include metabolic deficiencies, ultrastructural abnormalities of the sperm flagellum (see Primary ciliary dyskinesia) and necrozoospermia. [ 1 ] It decreases the sperm quality and is therefore one of the major causes of infertility or reduced fertility in men.
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The use of radiotherapy can cause a temporary bout of azoospermia, this however, is dependant solely on the nature of the dose that are delivered to the testes. Those who experience less than 100 rads will recover in 9–18 months, doses of 200-300 rads will recover in 30 months and doses of 400-600 rads will recover in less than or equal to five years.