Brachial plexus: formation, relations, branches and applied anatomy

• Brachial plexus: network formed by the anterior (ventral) rami of C5 to T1 spinal nerves, with minor variable contribution from C4 and T2.

Formation and Relations

Brachial plexus formation

• Four intermediate components, in order: roots (5) → trunks (3) → divisions (6) → cords (3); each trunk gives one anterior and one posterior division.