Thoracic Nerves Innervation ((free)) Jun 2026

After exiting the intervertebral foramen, each thoracic nerve splits into a dorsal ramus.

Unlike lower thoracic nerves, T1 and T2 contribute fibers to the brachial plexus (innervating the upper limb). T1 provides the root of the ulnar nerve and intrinsic hand muscles, while T2 contributes to the medial cutaneous nerve of the arm. thoracic nerves innervation