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FORMATION` `` It is formed in the posterior triangle of the neck. It is the union of the anterior rami of the 5th ,6th ,7th ,8th cervical and the 1st thoracic spinal nerves. DIVISIONS The plexus is divided into : Roots. Trunks. Divisions. Cords. Terminal branches. TRUNKS Upper trunk: Union of the roots of C5 & 6. Middle trunk : Continuation of the root of C7. Lower trunk : Union of the roots of C8 &T1. CORDS Each trunk divides into anterior and posterior division. Posterior cord : From the three posterior divisions. Lateral cord : From the anterior divisions of the upper and middle cords. CORDS Medial cord It is the continuation of the anterior division of the lower trunk. RELATION TO AXILLARY ARTERY TO (1ST Part) : The three cords are above and lateral. TO (2ND Part) : The cords are arranged according to their names : Medial cord: medial Lateral cord: lateral Posterior cord: behind RELATION TO AXILLARY ARTERY TO (3RD Part): Has the same relationship with the terminal branches of the brachial plexus. BRANCHES (A) FROM Roots : 1. C5: Nerve to rhomboids (dorsal scapular nerve) 2. C5,6 &7: Long thoracic nerve. BRANCHES (B) FROM Trunks (upper trunk): 1. Nerve to subclavius : It supplies subclavius and it can give a contribution to the phrenic nerve (acessory phrenic nerve). BRANCHES 2. Suprascapular nerve: It supplies supraspinatus and infraspinatus. BRANCHES (C) FROM Cords : 1. Lateral cord(3) A. Lateral pectoral. B. Musculocutaneou s. C. Lateral root of median nerve. BRANCHES 2. Medial cord (5): A. Medial pectoral. B. Medial cutaneous nerve of the arm. C. Medial cutaneous nerve of the forearm. 4. Ulnar. 5. Medial root of median nerve. BRANCHES 3. FROM Posterior cord (5): A. Upper subscapular. B. Lower subscapular. C. Thoracodorsal. D. Axillary. E. Radial. DISTRIBUTION OF NERVES IN THE FASCIAL COMPARTMENTS 1. Arm: Ulnar. Median. Musculocutaneous. Radial. 2. Cubital fossa: Ulnar. Median. Musculocutaneous. Radial. DISTRIBUTION OF NERVES IN THE FASCIAL COMPARTMENTS 3. Forearm : Ulnar. Median. Deep branch of radial.