Question Video: Identifying a Spermatogonium in a Cross Section of a Seminiferous Tubule | Nagwa Question Video: Identifying a Spermatogonium in a Cross Section of a Seminiferous Tubule | Nagwa

Question Video: Identifying a Spermatogonium in a Cross Section of a Seminiferous Tubule Biology

The figure shows a drawing of a cross section of the seminiferous tubules in the testes. Which cell is a spermatogonium?

02:44

Video Transcript

The figure shows a drawing of a cross section of the seminiferous tubules in the testes. Which cell is a spermatogonium? (A), (B), (C), (D), or (E).

The seminiferous tubules, one of which has been represented here as the large circular structure in the center of this diagram, are coiled tubes that make up the bulk of the testes in biological males. We can also see the edges of two other seminiferous tubules on the left of the diagram.

The seminiferous tubules are the site of sperm production, which is sometimes called spermatogenesis. Overall, spermatogenesis converts diploid primary germ cells, which are sometimes called primordial germ cells, into haploid mature sperm cells.

Let’s have a go at labeling some of the different cells that can be identified in this diagram. In the middle of each seminiferous tubule is a space called the lumen. Surrounding the lumen in the seminiferous tubule of a biological male who has begun puberty, there are sperm cells at various stages of development that follow the initial primary germ cell stage. The cells that are eventually produced from many mitotic divisions of the primary germ cells following the birth of the male are located furthest from the lumen and are called spermatogonia. A single spermatogonia is called a spermatogonium, which has been labeled with the letter D on this diagram, suggesting that this is the correct answer to this question.

Let’s double-check by identifying the other cells that have been labeled. The spermatogonia enter a type of cell division called meiosis, which halves the number of chromosomes in these diploid cells to eventually convert them into haploid cells called spermatids. The spermatids, one of which has been labeled with the letter B, are located closer to the lumen of the seminiferous tubule.

The spermatids then differentiate into haploid mature sperm cells, one of which has been labeled with the letter C, that can be released into the lumen.

The seminiferous tubules also contain cells called Sertoli cells, one of which has been labeled here with the letter A. One of the functions of a Sertoli cell is to secrete fluids to nourish and support the developing sperm cells.

Interstitial cells can be located in various regions of the body, between the functional cells of any particular tissue. Specific examples of interstitial cells in the testes are called Leydig cells, one of which has been labeled here with the letter E. Leydig cells are responsible for producing and secreting the hormone testosterone.

Having identified all of the labeled cells in this diagram, we can confirm which cell is a spermatogonium. The letter that identifies a spermatogonium is D.

Download the Nagwa Classes App

Attend sessions, chat with your teacher and class, and access class-specific questions. Download the Nagwa Classes app today!

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy