Sperm are male reproductive (sex) cells. The word "sperm" can refer to spermatozoon (singular) or spermatozoa (plural). Sperm are tiny cells with an oval-shaped body and a long tail. They measure just ...

Physical fitness does not always mean reproductive wellness. Sperm health is a hidden factor affected by heat, stress, and lifestyle. Many men are unaware of fertility issues until they try to ...

A man who received a transplant of his own testicular tissue, cryopreserved 16 years ago before he underwent cancer treatment ...

A man in his early 20s received a transplant of his own sperm-producing stem cells, which had been frozen since his childhood, in an attempt to regain fertility. Doctors are waiting to see if the ...