The extensor digitorum is a muscle located in the superficial compartment of the posterior forearm and its tendons pass though the fourth extensor compartment of the wrist.
The extensor digitorum originates from the lateral epicondyle of the humerus and its tendon divides into four in the distal forearm, eventually attaching to the extensor hood of each digit.
The primary action of the extensor digitorum is to extend the digits at both the interphalangeal and metacarpophalangeal joints.
The extensor digitorum is innervated by the deep branch of the radial nerve and supplied with blood by the radial artery.
Figure 1 illustrates the muscles located in the superficial layer of the posterior forearm.
The extensor digitorum is an important muscle of the posterior forearm and is involved in a variety of complex movements; these include flexion and extension of the hand and wrist, abduction and adduction of the fingers, and opposition of the thumb. It has several deep and superficial attachments that are necessary for its optimal functioning.
The extensor digitorum originates from the lateral epicondyle of the humerus. It has a long tendon that travels along the posterior forearm before dividing into four parts at the distal forearm. These tendons then attach to the extensor hood of each finger. The extensor digitorum is innervated by the deep branch of the radial nerve, which supplies it with motor signals to initiate its actions. Furthermore, the radial artery supplies it with the necessary oxygen and nutrients that are necessary for its optimal functioning.
The primary function of the extensor digitorum is to extend the digits of the hand at both the interphalangeal and metacarpophalangeal joints. This muscle also helps with stabilizing and supporting the wrist and hand, allowing them to move accurately when performing complex tasks. Additionally, the extensor digitorum helps with abduction and adduction of the fingers, as well as opposition of the thumb.
Overall, the extensor digitorum is a powerful muscle of the posterior forearm. It has several attachments that aid in its various functions, and is innervated and supplied with blood by the radial nerve and artery. The extensor digitorum has multiple actions and is essential for optimal functioning of the hand and wrist.
