Brachial Plexus Anatomy

Formed from C5 to T1 Roots

Roots unite to form Trunks Upper , Middle and Lower trunks ( From the anterior border of Scalene anterior)

Three trunks divide into 3 anterior and 3 posterior divisions ( From the lateral border of 1st Rib)

anterior divisions of the upper, middle, and lower trunks
posterior divisions of the upper, middle, and lower trunks

In relation with the 1st part of Axillary artery form 3 Cords The Medial, Lateral and Posterior Cords

Branches emerge from the Cords