<prompt> Erb-Duchenne paralysis occurs by lesion to brachial plexus at the level ofC4-C5C5-C6C6-C7C8-T1  <response>: Ans. b C5-C6. Ref: B L, Surgery, 22nd ed., 380.Erb - Duchene paralysis- C5 and C6 join to form upper trunk of brachial plexus ERBs point.- Nerve root involvedMainly C5 C6.- Site of injuryUppertrunk of brachial plexus, six nerves meet here.- Cause of injuryUndo separation of the head from the shoulder, which is commonly encountered in Birth injury, Fall on shoulder, during anaesthesia.- Muscle paralysedMainly biceps, deltoid, brachialis, brachioradialis, partly supraspinatus, infraspinatus supinator.- DeformityArm hangs by the side; its adducted medially rotated, forearm is extended pronated also called policemen tip hand or porters tip hand.- Disability Abduction lateral rotation of arm. Biceps supinator jerks are lost. Flexion supinator of the forearm Sensation lost over a small area over the lower part of deltoid. 