All of the folowing are FALSE about Erb's paralysis EXCEPT?

Injury to the upper trunk of brachial plexus causes Erb's paralysis. Nerve roots involved = C5 - C6 Muscles paralysed - Biceps brachii Brachialis Deltoid Brachioradialis Supraspinatus Infraspinatus paly Supinator Deformity: k/a - policeman / poer / waiter's tip hand Arm hangs by the side, adducted & medially rotated Forearm extended & pronated Disability: loss of the fall movements: Abduction & lateral rotation of arm at shoulder Bicep with supinator jerk lost Sensory loss over small area of deltoid.