The Pronator Syndrome occurs when the median nerve is compressed in the region of the pronator teres muscle (medial aspect of the antecubital fossa).
The median nerve travels between the superficial (humeral) and deep (ulnar) heads of the pronator teres muscle.
Adjacent structures are the aponeurosis of the biceps brachii muscle and the insertion of the flexor digitorum superficialis.
Conditions associated with compression or entrapment of the median nerve:
(1) congenital anomaly or hypertrophy of the pronator teres muscle
(2) aponeurotic prolongation of the biceps brachii muscle
(3) hematoma
(4) soft tissue tumor
(5) prolonged external compression
(6) fracture at the elbow
