They remove the cytoplasm from our spermatid to produce the sperm cell. And we'll discuss what the structure is of the sperm cell in just a moment. Once the sperm cells are actually formed they are released into the lumen, the cavity of the seminar's tubule. And now the sperm cells can travel along the lumen of the seminar philosophy tubule and eventually they end up in the epididymus. And once inside the epididymus this is where they mature into sperm cells that look like this. And this is also where our sperm cells are stored before they're released the outside environment.