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.

What Is the Mobile Wad?

By Rebecca Harkin
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.

In human anatomy, the mobile wad describes the portion of the forearm where three distinct muscles join and work together. The wad is responsible for such actions as flexing, twisting, and most wrist movements. These are normally thought of as more complex muscular commands that often require coordination of several groups in order to execute efficiently. In the case of the mobile wad, these muscles are the extensor carpi radialis brevis, the extensor carpi radialis longus, and the brachioradialis. All three of these forearm muscles act collectively as flexors to bend the elbow joint, lessening the angle of this joint and allowing the arm to curl upward. In some places and references this group of muscles is also referred to as the wad of Henry, the lateral compartment, or the radial group.

Understanding Muscle Grouping Generally

Muscles are usually thought of as bundles of dense fibers that assist the body in executing movement. They wrap around the skeleton adding flexibility and stability, and while each is distinct few work alone: in most cases they’re wrapped around and intersect with each other in important ways. This is certainly true where the lower arm and wrist are concerned, and one of the reasons the muscles here are referred to as a “wad” is because of how closely they’re stacked and almost woven together.

Muscles of the legs and arms are normally grouped together in compartments. These compartments are bound by a strong protective covering of connective tissue and are innervated with exclusive supplies of nerves and blood. The three primary compartments of the forearm are the mobile wad, the volar, and the dorsal.

Specific Tasks of the Forearm Muscles

Forearm muscles are responsible for a variety of finely controlled motions, such as bending the wrist inward and rotating the wrist around. These complex movements are possible because the forearm is composed of approximately 20 muscles layered over and anchored to the forearm bones, the radius, and the ulna. Three of these 20 muscles — the extensor carpi radialis brevis, the extensor carpi radialis longus and the brachioradialis — make up the mobile wad and work jointly to bend the arm up and inward.

Flexing and Twisting

The top part of the brachioradialis muscle originates at the lateral supracondylar ridge of the humerus, or the far end of the humerus where the bone begins to flare out into the nub called the epicondyle. The bottom part of the brachioradialis attaches to the styloid process of the radius, or the bump on the radius bone near the wrist. The brachioradialis muscle functions together with the other radial group muscles to flex the forearm. This muscle also works to pronate the forearm, which basically means to twist the arm toward the center of the body, and to supinate the forearm, or turn it outward.

Wrist Movements

Also originating on the top at the lateral supracondylar ridge of the humerus is the extensor carpi radialis longus muscle. This muscle is normally much longer than the brachioradialis and is anchored at its far end on the top side of the index finger’s first bone. Along with acting in concert with the other muscles in the wad as an elbow joint flexor, this muscle also controls a variety of wrist movements including extending and bending the wrist outwards.

Extension and Outward Movements

Near the elbow, the extensor carpi radialis brevis originates at the lateral epicondyle of the humerus, which is the protrusion at the far end of the bone. This muscle extends down the forearm and is bound onto the base of the middle finger. The extensor carpi radialis brevis flexes the forearm and, much like the extensor carpi radialis longus muscle, also controls extension and outward movements of the wrist.

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.
Link to Sources
Discussion Comments
By anon246317 — On Feb 08, 2012

"That runs along the inside of the forearm" is potentially misleading because the forearm pronates. In the anatomical position, the thumbs are pointed outward placing the mobile wad in a lateral position. Otherwise it would be the medial compartment and not the lateral compartment.

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.