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 from 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.

What Is the Ethmoidal Bulla?

Mary McMahon
Updated Mar 03, 2024
Our promise to you
The Health Board is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

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.

Editorial Standards

At The Health Board, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

The ethmoidal bulla is an important component of the ethmoid sinus, one of the air cavities in the skull. The sinuses provide a number of functions, including air filtration and warming. This structure is significant for clinicians because it can be used as a landmark in surgery, and may also be involved in some sinus disorders. It is visible on radiographs specifically designed to evaluate the sinuses and can also be seen in some procedures involving the sinuses.

This structure forms a bulge of ethmoidal cells that can vary in precise shape and size from patient to patient. The sinuses are, in their own way, much like fingerprints, because they form individually and look very distinct, forming a complex labyrinth of air cells. In fetal development, the ethmoid sinus is one of the first to form and it keeps developing, giving rise to structures like the ethmoidal bulla.

There are two ethmoidal bullae, one in each sinus. They are located toward the front of the skull between the eyes, and are closely associated with the boundary between the sinus and the skull cavity. Inside the ethmoidal bulla, individual cells can grow in a variety of patterns. Each structure is located just above the infundibulum, the drainage cavity that allows the contents of the sinuses to flow away so they don’t become filled with mucus.

Before surgery on the sinuses, a doctor may request medical imaging studies to look at the structures of the skull, including the ethmoidal bulla. This can provide important navigational information that will be used in surgery. It can also offer insight into why the patient experiences problems like recurrent sinus infections or eye problems, which are sometimes associated with abnormalities in sinus structure. Some facilities have technology that allows surgeons to create three-dimensional reconstructions of the sinuses for practice and training purposes so they can perform surgery with a high degree of accuracy.

Once the surgeon starts work, the ethmoidal bulla can be located as a landmark to help the doctor get oriented. Working in the twisting, honeycomb-like sinus cavities can be confusing and surgeons work with care to avoid causing injuries. Being able to locate and fixate on a structure can help the surgeon focus and perform the procedure. This might involve an activity like removing excess bone to allow sinuses to drain or correcting an abnormality that makes it hard for the patient to breathe. It is typically performed endoscopically with small instruments and a camera inserted into the sinus cavity for the surgeon to work.

The Health Board 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.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a The Health Board researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
The Health Board, in your inbox

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

The Health Board, in your inbox

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