We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.
Health

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What are Seminiferous Tubules?

By Katriena Knights
Updated: May 17, 2024
Views: 41,139
Share

Located in the testicles, the seminiferous tubules are tiny tubes in which spermatozoa or sperm cells are formed. They are lined with Sertoli cells, specialized cells that serve as a sort of "nursery" for growing sperm cells. Spermatogenic cells line the layer of Sertoli cells, and they mature into full-fledged sperm through a complex process called meiosis. Seminiferous tubules are found in all mammals, as well as in birds and some fish.

The interior of the testicle is divided into lobules, or separate sections, by septa. Septa are formed from connective tissue and serve as a sort of wall between each section. Each section contains several seminiferous tubules, where sperm cells form and from which they are secreted. Surrounding these tubules are Leydig cells that excrete testosterone and other hormones. These cells are formed in utero but remain dormant until puberty, when hormones are released and the process of meiosis begins.

Each tubule contains a convoluted section and a straight section. The convoluted section folds in and over itself, allowing a greater length to function in a smaller space, and the straight section allows mature sperm to exit the testicles. It is within the convoluted section that meiosis occurs. Meiosis is a process by which special cells are created that contain only half the number of chromosomes of other cells. These special cells are called gametes, a term that can refer to either the male sperm or the female ovum.

Seminiferous tubules are structured in such a way as to prevent large molecules from entering. Sertoli cells lining the tubules contribute to this barrier because they are tightly connected to each other. It is generally believed that this barrier is to prevent the body's natural immune reactions from contacting the sperm, which the immune system could interpret as a threat.

Malformation or absence of the seminiferous tubules can result in infertility. One such condition is Sertoli-cell-only syndrome, in which the body has produced Sertoli cells, but the tubules are absent. In such cases, production of sperm cells is impossible. Some genetically linked diseases appear to occur because of a malfunction in meiosis, meaning that such conditions are coded into the sperm before it even leaves the testicles. These conditions usually are caused by a malformed gene or chromosome, and they include Huntington's Disease and other disorders.

Share
WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Editors' Picks

Discussion Comments
By anon280721 — On Jul 19, 2012

What about the lining of the seminiferous tubules?

By BostonIrish — On Feb 10, 2011

The vas deferens carries the mixture of fluid and sperm cells forward into the penis, allowing for easy ejection of the semen. This duct draws from the seminiferous tubules and pushes the whole compound forward.

By BigBloom — On Feb 09, 2011

The male reproductive system is a complex facility which interacts with various other systems to produce the sex drive, male hormones, and sperm. During intercourse, it interacts perfectly with the corresponding female system, creating the only true "organ link" possible in most living organisms.

Share
https://www.wisegeek.net/what-are-seminiferous-tubules.htm
Copy this link
WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.