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The muscles of the posterior compartment of the forearm produce wrist and/or finger extension and thumb abduction. They are located posterior to the interosseous membrane and are arranged as twelve muscles in two layers (superficial and deep).
The superficial posterior forearm muscles act together to produce movements of the forearm, hand and fingers. More specifically, these muscles produce: Flexion of the forearm at the elbow joint. Extension, adduction and abduction of the hand at the wrist joint. Extension of the digits 2-5.
The muscles of the upper limb can be divided into 6 different regions: pectoral, shoulder, upper arm, anterior forearm, posterior forearm, and the hand. There are 4 muscles of the pectoral region: pectoralis major, pectoralis minor, serratus anterior and subclavius.
The majority of muscles found in the posterior compartment are extrinsic, meaning that their origin has some distance from the part moved. The brachioradialis and the anconeus are considered intrinsic muscles because they both arise within the forearm and they both move the forearm.
The forearm muscles are divided into two compartments based on location and action: the anterior or flexor compartment and the posterior or extensor compartment. There are a total of 19 muscles in the forearm that help move not only the elbow and wrist joints but also the joints in the hand and fingers.
The deep posterior forearm muscles are a group of five muscles located in the deep layer of the posterior compartment of the forearm. These muscles include the supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus and extensor indicis.
Muscles. Just like the arm, the forearm is divided into two compartments by deep fascia; the interosseous membrane, and the fibrous intermuscular septa. This creates an anterior compartment that contains the flexor muscles, and a posterior one that contains the extensor muscles.