Brachial Plexus, Root & Trunk portion
Brachial plexus formed by the anterior primary rani of lower four cervical nerves & first thoracic nerves (C5 C6 C7 C8 T1)
Root 5
Trunks 3 : upper, middle & lower
Division 6: anterior & posterior of each
Cords 3:
Lateral cord: LML
Posterior cord: ULNAR
Medial cord: M4U