Original sentence: It is also sometimes known as the "lateral compartment" of the forearm
Edited sentence: At the carpal joints longus acts in dorsiflexion with the extensor carpi ulnaris and in radial abduction with the flexor carpi radialis.Brachoradialis is inserted distally on the radius end therefore, unlike the previous two muscles, only acts on the forearm.Brevis moves the arm from ulnar abduction to its mid-position and flexes dorsally.In slow movements and in the supinated forearm it has a minimal flexor action.It brings the forearm into midposition between supination and pronation, and in this position it acts as a flexor.It is also sometimes known as the "lateral compartment" or "radial group" of the forearm.Longus is a weak pronator in the flexed arm and a supinator in the outstretched arm.The extensor carpi radialis brevis and longus are both weak flexors at the elbow joint.These three muscles act as flexors at the elbow joint.These two muscles are called "fist clenchers" because they must be slightly flexed dorsally during clenching to permit maximal flexion