Your swimmers have a heck of an adventure before they can fertilize an egg. Sperm travel through a complex network of tubes even before ejaculation, and a blockage along the route can throw a wrench into your paternity plans. If you're finding it difficult to conceive, you may need surgery or fertility treatments to restore reproductive abilities.

Types and prevalence of azoospermia

A minimum of 15 million sperm per milliliter is considered a normal sperm count. However, about 1 percent of men suffer from azoospermia, a condition in which the ejaculate contains no sperm. There are two primary causes of azoospermia: issues with sperm production or the inability of sperm to travel out of the body.

Different tubes are responsible for carrying sperm from their origin point, the testicles, to the point of exit, the urethra. Blockages in any part of the pathway are a possible cause of male infertility, known as obstructive azoospermia. About