Extensor Thumb Long

Extensor thumb of the hand Long: Anatomy and Functions

The extensor pollicis longus muscle, also known as the extensor pollicis longus muscle, is one of the key muscles of the hand that allows movement of the thumb in the direction opposite to its flexion. This muscle is located on the back of the forearm and consists of a long, thin bundle of muscle fibers.

The anatomy of the extensor pollicis longus is quite complex. The muscle starts at the wrist and runs up the forearm, then through a canal in the hand called the radial nerve canal, and ends at the thumb. This muscle is controlled by the radial nerve, which also supplies other muscles in the arm.

The functions of the extensor pollicis longus include movement of the thumb in the direction opposite to its flexion. This movement is especially important when performing tasks such as grasping objects and operating tools. In addition, the extensor pollicis longus helps stabilize the hand and forearm during various movements.

It is important to note that the extensor pollicis longus can become the target of damage and injury. For example, if a muscle is overused or stretched, a ligament of muscle fibers may rupture, resulting in pain and impaired movement of the thumb. Also, if the radial nerve, which innervates this muscle, is damaged, problems with its function may occur.

In conclusion, the extensor pollicis longus muscle is an important muscle of the hand that allows movement of the thumb in the direction opposite to its flexion. Understanding the anatomy and function of this muscle can help solve problems with its function and prevent injury.

Extensor pollicis longus. Musculus extensor policis longus. Beneath the palmaris longus muscle, towards its proximal end, lies its bipinnate joint. The sesamoid bone, the process of the clavicle, holds it on the dorsum of the hand. On the medial side, a thin tendon attaches to the base of the II, III, IV and V phalanges of the thumb. Function: extends the thumb.