Cause-hyper abduction if shoulder.lower plexus root involved.
Ex-difficult breech delivery,holding on to something during a fall , cervical rib syndrome,scalene syndrome
Nerves involved - C8-T1
Muscle involved- all intrinsic muscle of the hand
Position of the upper limb/hand-claw hand
Sensory loss present over the medial border of forearm and hand
May be associate with horners syndrome.