Assalamualaikum students, today's topic is sperm metogenesis What is sperm metogenesis? Sperm metogonia Sperm metogonia is the process of conversion of sperm metogonia into spermatozoa Sperm metogonia is the process of conversion of sperm metogonia into spermatozoa Sperm metogonia is the process of Primordial Jump Cells came in Epiblast cells in 2nd peak of development and they moved from Epiblast to Yoxac through Primitive Streak and from Yoxac they went to developing gonads and from developing gonads they have to have mitosis and meiosis and they have to differentiate in spermatozoa so this was your small pathway trace which we did that where do primordial jump cells come from now we will see how spermatozoonia will go in spermatozoa One thing you need to remember is that the process of spermatogenesis starts only after puberty. So it will be initiated after puberty.
What will happen is that if we look at the levels of puberty a little earlier, the spermatozoonia, the young cells are present in the sex codes as yellowish and there is no differentiation in them. But in puberty, two hormones will work here, LH and FSH. both these hormones are their role LH will give signal through multimeter like we have this legging cells which will release testosterone testosterone will stimulate sartoli cells sartoli cells will be covered by limits So, these serotonic cells are there to start the differentiation or maturation process of spermatogenesis. There was a passage also, now when spermatogenesis is to start, first of all, what are those?
These were primordial stem cells. You have to write only steps. If you want to ask about spermatogenesis, then you have to write steps.
These are primordial stem cells. From these stem cells, what you have to do is, you will make stem cells. under the hormonins it will make a lumen from the stem cell and from the stem cell it will release sperm, this will be differentiated spermatozoon will come now what is happening here mitosis, because of mitosis what you have spermatozoon till here you have mitosis I told you that there are only two things on the germ cells mitosis and meiosis till here you have mitosis and you have primary spermatocyte on primary spermatocyte you have meiosis 1 you will have meiosis 1 when you will have secondary spermatocyte like in female genesis we saw meiosis 1 for a long time around For 13 to 14 years, you have to be arrested in Prophes 1. But there is no such thing in the male, because the whole process starts in puberty.
But meiosis 1 will also be in Prophes for approximately 22 days. And after that, it has to complete its prophes. It has to complete meiosis 1 and what will be made?
Secondary spermatocyte. What will start on the secondary spermatocyte? Meiosis 2. When meiosis 2 starts, what will be made?
Spermated. Okay? Spermated will be formed and there are 2-3 steps of Spermated maturation and after that you will have Spermatozoa.
So in this way, you have Spermatozoa derived from primordial germ cells which is Spermatogenesis. And another process is in this chapter which we call Spermiogenesis. If you talk about where you are looking from Spermatogonia, you are looking at the developmental Spermatozoa.
So you call this process Spermatogenesis. But if you want to see this differentiation from here. spermatozoa is called spermiogenesis so if you have spermatogonia if it goes into spermatozoa then we call this process spermatogenesis but if we see how spermatids are differentiated into spermatozoa then we call this process spermiogenesis So, you know the difference between these two terms. If we want to talk about the full pathway, then there is spermatogenesis. But if we want to see the steps here, then what do you have?
Spermiogenesis. So, I will show you the steps of spermiogenesis. First of all, what we have is the formation of acrosome. Acrosome means the upper region of the acrosome.
So, this whole portion of the acrosome, here you have many enzymes and mitochondria which will give energy for movement and many enzymes which will help in the ectopenifluidation. So, all these processes are to happen in formation of acrosome. After that, there will be nucleus condensation. What will the nucleus do?
It will condense. After Nucleus Condensation, it will be head, middle region, sorry neck, middle region and tail. So, the third step will be that what is being formed in your body?
Neck, middle region and tail. Then what will happen is that some residual bodies are there, some extra parts are there which we do not need. So, the residual bodies will be shed down.
The shedding of residual bodies. So, we have completed spermatozoa from spermatids. So, in this process, we call it spermiogenesis. So, this is the difference between spermatogenesis and spermiogenesis. Spermiogenesis is for further maturation or further growth.
Spermatogenesis starts from primordial germ and ends here. So, this is a very short step that where do you have primordial germ cells. In stem cells, you will have spermatogonia type A and type B.
After that, your meiosis will start. start primary spermato cyte will be there and then you will have spermatozoa so this was simple about spermato genesis and spermato meogenesis you can ask me about the names of the steps you have to trace the pathway of these steps because these are the steps to be written thank you so much