July 27, 2010
In The ‘Neck’ Of Time: Scientists Unravel Another Key Evolutionary Trait
By deciphering the genetics in humans and fish, scientists now believe that the neck "“ that little body part between your head and shoulders "“ gave humans so much freedom of movement that it played a surprising and major role in the evolution of the human brain, according to New York University and Cornell University neuroscientists in the online journal Nature Communications (July 27, 2010.)
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.
"A neck allowed for improved movement and dexterity in terrestrial and aerial environments," says Andrew Bass, Cornell professor of neurobiology and behavior, and an author on the paper. "This innovation in biomechanics evolved hand-in-hand with changes in how the nervous system controls our limbs."
Bass explained that this unexpected level of evolutionary plasticity likely accounts for the incredible range of forelimb abilities "“ from their use in flight by birds to swimming by whales and dolphins, and playing piano for humans.
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