If humans had a similar body ratio to the northern giant mouse lemur, their testicles would be the size of grapefruits.

Medically reviewed by Matthew Wosnitzer, MD People with male reproductive anatomy usually have two testicles (testes), ...

This review explores the multifaceted relationship between testosterone and men's health. Testosterone is essential for male ...

That's why the testes hang down, away from the body, for most mammals. So when you wear tight underwear, the resulting increase in temperature can damage the sperm, and potentially your fertility ...

The temperature of the testes is at issue: In order for testes to produce sufficient quality and quantity of sperm, the temperature of testes must be lower than the core body temperature.

Two hormones are critical in normal sex differentiation. The testes of normal 46,XY males secrete both Müllerian Inhibiting Substance (also known as MIS or antimüllerian hormone) and ...

Leydig cell tumours (LCT) are rare sex-cord gonadal tumours that account for less than 5% of testicular neoplasms. They are ...