In The 'Neck' Of Time: Scientists Unravel Another Key Evolutionary Trait

Scientists now believe that the neck gave humans so much freedom of movement that it played a surprising and major role in the evolution of the human brain.

Scientists had assumed the pectoral fins in fish and the forelimbs (arms and hands) in humans are innervated--or receive nerves--from the exact same neurons. After all, the fins on fish and the arms on humans seem to be in the same place on the body. Not so.