Adult Brachial Plexus Injuries Adult brachial plexus injuries are becoming increasingly common. In adults most common cause is motor cycle accidents, other notably causes are tumors, radiotherapy and iatrogenic. brachial plexus is a plexus of nerves which arise out of lower cervical (C5-C8) and first thoracic T1 spinal nerves.Anterior primary rami which are motor in function participate in plexus formation. They supply motor and sensory innervation to upper limbs from shoulder to hand. In the C5 and C6 forms upper trunk just after exiting scalene triangle,C7 continue as middle trunk and lower two(C8&T1) joined as lower trunk. They gives rise to cords which are below clavicle and followed by terminal branches. All posterior division arising from trunks forms posterior cord which gives arise to terminal branches, anterior division of upper trunk give arise to lateral cord and medial ...
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