What is erbs palsy?

Erb's palsy: Is a paralysis of the arm caused by injury to the upper group of the arm's main nerves, specifically the upper trunk c5-c6 is severed. These injuries arise most commonly, but not exclusively, during a difficult birth. Depending on the nature of the damage, the paralysis can either resolve on its own over a period of months, necessitate rehabilitative therapy, or require surgery.