<prompt> The root value of axillary nerve isC5, C6C7, C8C8, T1C5, T1  <response>: axillary nerve also known as circumflex nerve - The axillary nerve is a branch of the posterior cord of the brachial plexus and the root value is C5 , C6. Axillary or circumflex nerve is an impoant nerve because it supplies the deltoid muscle which is the main abductor of the arm. Ref : B D Chaurasias Human Anatomy , Seventh edition, volume 1 , pg. no, 75. 