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Male infertility refers to the inability of a male to achieve a pregnancy in a fertile female. In humans it accounts for 40-50% of infertility. Male infertility is commonly due to deficiencies in the semen.
Pre-testicular factors refer to conditions that reduce hormonal stimulation of the testes:
The prostate gland is a small gland that is only found in men. It is located between the penis and bladder and it surrounds the urethra (the tube that carries urine from the bladder to the penis).
The prostate gland helps with the production of semen (the fluid that transports sperm). It produces a thick, white fluid that is liquefied by a special protein called prostate-specific antigen (PSA). The fluid is mixed with sperm, produced by the testicles, to create semen.
There are a number of conditions that can affect the prostate gland including:
Smoking is still controversial in its effect on sperm production.
Inborn faults in the composition of the genetic footprint (DNA) or environmental damage to the DNA molecule might cause sub-fertility.
Testicular factors refer to conditions where the testes produce semen of low quantity and/or poor quality despite adequate hormonal support and include:
Post-testicular factors decrease male fertility due to conditions that affect the male genital system after testicular sperm production and include defects of the genital tract as well as problems in ejaculation: