The brachial plexus is a group of nerves from ventral rami C5, C6, C7, C8, and T1 that innervate the upper extremity. \n.
\nIf the upper nerves are injured (i.e. C5, C6) thi…s is called Erb's Palsy. This can happen as a result of the shoulder being pushed inferiorly. One such example is Shoulder Dystocia. Clinical manifestation includes Waiter's Tip sign.\n.
\nIf the lower nerves are injured (i.e. C8, T1) this is called Klumpke's Palsy. A scenario in which this could happen is when an individual falls out of a tree, tries to grab a brand, and their arm gets yanked as they fall. (MORE)