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The extensor digitorum muscle (also known as extensor digitorum communis) [ 2 ] is a muscle of the posterior forearm present in humans and other animals. It extends the medial four digits of the hand. Extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve. [ 3 ]
Extensor digitorum longus muscle. The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.) The extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg.
The third compartment exclusively accommodates the extensor pollicis longus, which hooks around Lister's tubercle of radius and inserts to the thumb. The fourth compartment is the largest of all. It is occupied by the extensors of the digits, the extensor digitorum communis and the extensor indicis proprius.
The common extensor tendon serves as the upper attachment (in part) for the superficial muscles that are located on the posterior aspect of the forearm: The tendon of extensor carpi radialis brevis is usually the most major tendon to which the other tendons merge. [2]
Flexor digitorum superficialis and profundus, lumbricals, and interossei, assisted in the case of the little finger by the flexor digiti minimi brevis: extensor digitorum communis, extensor indicis proprius, and extensor digiti minimi muscle: thumb: flexor pollicis longus and brevis: extensor pollicis longus and brevis
Deep muscles. Extensor indicis muscle is labeled in purple. In human anatomy, the extensor indicis (proprius) is a narrow, elongated skeletal muscle in the deep layer of the dorsal forearm, placed medial to, and parallel with, the extensor pollicis longus. Its tendon goes to the index finger, which it extends.
Extrinsic extensor muscles of the hand. The extrinsic extensor muscles of the hand are located in the back of the forearm and have long tendons connecting them to bones in the hand, where they exert their action. Extrinsic denotes their location outside the hand. Extensor denotes their action which is to extend, or open flat, joints in the hand.
The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm.