Introduction: The radial nerve is a nerve that arises from the posterior cord of the brachial plexus and supplies the posterior side of the upper limb. Its nerve root is from C5 to C8 and T1. Wrist drop is a medical condition in which the entrapment or compression of RADIAL NERVE leads to decreased or blocked impulses to the extensor muscles of the arm, forearm and hand namely, It supplies the under mentioned muscles. Extensors of the elbow: Triceps Brachii (medial and lateral head) Brachioradialis Supinator muscle Anconeus Extensors of the wrist: Extensor carpi radialis longus Extensor carpi radialis brevis Extensor carpi ulnaris Extensors of the Digits and thumb: Extensor digitorum Extensor pollicis longus Extensor pollicis Brevis Extensor indices Extensor digiti minimi Abductor pollicis longus MECHANISM OF INJURY IN WRIST DROP: Radial nerve can be compressed or entrapped in FOUR major locations in the upper extremity that may lead to wrist...