Extensor digitorum radialis

The finger extensors have a meridian and segmental structure. In the posterior part of the forearm, they are innervated by spinal nerves C8, T1; in the wrist area - the ulnar nerve. All 3 muscles are innervated by the posterior interosseous nerve, which branches off from the subsequent posterior interscapular nerve C8-T2. Therefore, these muscles are easily damaged, which is manifested by paralysis of the thumb, index, middle finger, or all these fingers at the same time. In addition, particularly severe extensor paralysis can occur when the posterior interosseous nerve is compressed due to entrapment by the fascia of the forearm.

The extensor digitorum radialis, also known as the extensor carpi muscle, is one of the muscles of the forearm that is responsible for extension and abduction of the thumb and other fingers. This muscle is located on the back of the forearm, next to the ulna and radial nerve.

The function of the extensor digitorum radialis is to extend the thumb and fingers of the hand, allowing a person to hold objects, use tools, and perform other tasks that require the use of these muscles. Additionally, the extensor digitorum radialis helps maintain proper posture and prevent wrist pain.

The extensor digitorum radialis is one of the most important muscles of the forearm and plays a key role in a person's daily life. When this muscle is damaged, a number of problems can occur, such as pain, weakness, and difficulty using the thumb. In such cases, it is necessary to consult a doctor for diagnosis and treatment.