The Innovation of the Axilla

T1 is a brachial plexus nerve that innervates the upper limb. When you're doing a T1 nerve root block, you're helping that patient have forearm anesthesia not necessarily anything to do with breast or axilla. So maybe there's some variation there. I've never found it to be important. We wrote a paper very recently on this for a week, breast surgery and B.J. education. It was so complicated because if you consult multiple references, multiple anatomical references, there is no consistency into how they demonstrate the dermatomal innovation. And I've seen some really bizarre ones to some that kind of vary very slightly.