We just learned about the Cervical Plexus.
We know that there are 12 thoracic nerves in the spinal cord, T1 - T12.
The first 11 of those, T1 - T11 are called the Intercostal Nerves.
These nerves control your arms, your muscles around your chest and stomach, and the feeling in your skin.
(from: wikipedia - intercostal nerves)
Kid Facts - Blast from the past: Radial and Ulnar Veins