That's probably the Ulnar nerve. It is part of the Brachial plexus (in the arm), which includes nerves from Cervical nerve #5 (C5) to Thoracic nerve #1(T1). Thoracic nerve #1 originates in the 1st Thoracic vertebrae ("T1"). There are more nerve plexi than there are vertebrae, mind you, so some vertebrae have multiple plexi.
If only I was this thorough in studying for my exams...
Sorry I can't offer any online resources for you
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