![]() It is important to note that the palmaris longus muscle may be absent on one or both sides in some individuals. ![]() Innervation is provided by the median nerve (C7–C8). ![]() There are four fascial compartments in each of the upper limbs: the anterior and posterior compartments of the arm, and the anterior and posterior compartments of the forearm. The primary action of the palmaris longus muscle is to resist shearing forces of the palmar aponeurosis it is also considered a wrist flexor. Compartments are separated from one another by special bands of fascia called intermuscular septa. Attaches to the medial epicondyle of the humerus and courses superficially over the flexor retinaculum to the palmar aponeurosis in the hand. The median nerve (C6–C7) supplies innervation to this muscle. The primary action of the flexor carpi radialis muscle is wrist flexion and radial deviation. The intrinsic muscle compartments of the hand also may be involved. Attaches to the medial epicondyle and the base of metacarpals 2 and 3. ACUTE COMPARTMENT SYNDROME ANATOMY OF THE FOREARM ETIOLOGY ESTABLISHED VOLKMANN. The median nerve provides innervation (C6–C7) to the pronator teres muscle. The pronator teres muscle primarily produces pronation at the forearm. Distally, the pronator teres muscle attaches to the midshaft of the radius. The humeral head of the pronator teres muscle attaches to the medial epicondyle and the supraepicondylar ridge of the humerus, and the ulnar head attaches to the coronoid process. Forearm shaft fractures have been reported in 34 of a recent series of patients with compartment syndrome of the forearm Duckworth. Possesses two heads and crosses the elbow complex.
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