Which roots form the three trunks of the brachial plexus?
(1) Superior trunk, formed by C5 and C6;
(2) middle trunk, formed by C7; and
(3) lower trunk, formed by C8 and T1
(1) Superior trunk, formed by C5 and C6;
(2) middle trunk, formed by C7; and
(3) lower trunk, formed by C8 and T1