The first thing that most people think when they hear the word “spermatogenesis” is the picture of a man getting his testicles injected with a bunch of sharp needles.
The reality is that spermatogenesis is a process that happens in very different stages than any other kind of female reproductive process. There are two kinds of spermatogenesis: spermatogonial (sperm cells are produced from spermatogonia), and spermatocyte (sperm cells are produced from spermatocytes).
The first sort is called oogenesis, and you just have to go through a whole lot of trial and error to get spermatogonia out of the way. It’s like a testicle for sperm cells. You can’t go back to the testicle for spermatogenesis.
The other sort is called spermatogonial. It’s almost like a testicle for spermatocytes. In fact, there are two kinds of spermatogonial sperm cells. The first sort is called oogenesis. I just described that process as a testicle for sperm cells.
Oogenesis is what you get when you get these first, tiny, squashed-out spermatocytes. Oogenesis is the process that gives us sperm and eggs, but in order to get those, you need a second sort of spermatogonial, which is called spermatogenesis. This second sort is what our protagonist just lost. He didn’t know he had to go through that process.
As it turns out, it’s true. The first sort of sperm is called spermatogonia, the little oocytes that, in most cases, are the source of genetic material found in sperm. These spermatogonia are small, squashed-out cells that are the source of all the sperm cells and of all the eggs you see in your testes. These cells are the source of all the genes in sperm and all the genes in your egg.
No one really believes that it’s a good idea to have your sperm in each of the four cell types of your egg. They’re the ones that produce the cells, and that’s what you’re going to get once you break out the egg to start the sperm cycle. You’ve got to have a good idea of what you want the sperm to do, of what it wants to do, and how to break it out for you.
In this episode, Dr. David Strahl of the Institute on the Developing Child explains that there are two different types of sperm. Spermatogenesis, or the process of growing sperm cells, is the process of adding and changing the genes into sperm cells. And oogenesis, or the process of dividing the sperm into eggs, is the process of producing the eggs. The two processes are intertwined.
The sperm is the male of the two, but there are differences between the two. Sperm are very small, and they are very different from each other. Spermatogenesis (proliferation) happens while developing sperm cells, and it’s not something that happens very often. And then oogenesis (division) happens at each stage of spermatogenesis. There is not a lot of overlap between oogenesis and spermatogenesis.
Sperm are very small. We can look at the egg cell and it is clearly larger than the sperm cell. The sperm cell is almost certainly not the size of an egg cell, but it is clearly larger than the egg cell. Spermatogenesis starts at the tip of the sperm, and oogenesis is more diffuse.