What are the 4 Stages of Spermatogenesis?

The diagram of spermatogenesis shows 4 stages of spermatogenesis which are:

Spermatogonial Phase

• The basal membrane of the seminiferous tubules contains spermatogonial stem cells, which divide to initiate the process of spermatogenesis.
• Mitotic division of spermatogonial stem cells yields two distinct daughter cell types: Type A spermatogonia, which are responsible for maintaining the stem cell pool, and Type B spermatogonia, which develop into primary spermatocytes.

Meiotic Phase

• Meiosis is a specific kind of cell division that primary spermatocytes which are generated from Type B spermatogonia go through in order to create haploid germ cells.
• Meiosis I and Meiosis II are the two consecutive divisions that make up meiosis.
• Meiosis II splits sister chromatids, producing four haploid cells known as spermatids, while meiosis I splits homologous chromosomes, halving the number of chromosomes.

Spermiogenic Phase

In a process called spermiogenesis, spermatids change significantly morphologically to become mature spermatozoa, or sperm cells.

Several stages are involved in spermiogenesis, including

• Golgi Phase: The acrosomal vesicle, which carries fertilization-related enzymes, forms.
• Cap Phase: The spermatid nucleus elongates during the cap phase, and an acrosomal cap forms over the nucleus.
• Acrosomal Phase: The front part of the sperm head is covered by the acrosome, a structure that develops from the Golgi apparatus.
• Maturation Phase: The sperm cell becomes smaller via the formation of the flagellum, or tail, and the elimination of extra cytoplasm.
• Spermiation: Mature sperm cells are released from Sertoli cells into the seminiferous tubule lumen during spermiation.

Spermiation and Sperm Maturation

• Spermiation is the process by which mature sperm cells are discharged into the lumen of the seminiferous tubules.
• Sperm cells continue to develop and gain motility after spermiation as they travel into the epididymis, where they are retained until ejaculation.

The diagram of spermatogenesis shows the process by which sperm cells develop in the testes which is crucial for reproduction in males. In the process of spermatogenesis, haploid spermatids are produced by the mitotic division of spermatogonia and two rounds of meiosis in primary spermatocytes. The diagram of spermatogenesis class 12 is important to understand the formation of sperm production and the male reproductive system.

Spermatogenesis is a well-controlled process that guarantees the constant generation of viable sperm cells. The labeled diagram of spermatogenesis is given below: