CAUSES OF MALE INFERTILITY:

OLIGOSPERMIA (small number of spermatozoa): men usually produce at least 20 million spermatozoa for millimetre of liquid seed (which is one sixth of produced liquid); a smaller amount may cause sterility.

AZOOSPERMIA (absence of spermatozoa in the ejaculate): it can derive from a defective production or when outflow ways are obstructed or congenitally absent (epididymis and related tubes).

ASTENOSMERMIA (reduced movement of spermatozoa): in such case nemaspermatic cells are incapable to move through ovulatory cervical mucus and meet the oocyte in the fallopian tube.

TERATOSPERMIA because of their defective shape, the spermatozoa cannot penetrate the external surface of the oocyte.

Coitus problems for inability of ejaculation or even impotence.

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