So in the epididymus the sperm cells not only mature into cells that look like this but the epididymis also serves to store those sperm cells before being released to the outside environment. Now let's take a look at the structure of the mature sperm cell. So we have a head, we have a midsection and we have a tail. Now the head consists of the nucleus that contains a haploid number of chromosomes. So in males, in male humans that's 23 chromosomes. We also have the red section that is basically known as the acrosome.