OM at ryggraden utviklet seg før hjernen, og at det viser seg at ryggraden sender signaler ikke bare ut i armer og bein, men samtidig opp til hjernen.

http://www.unibas.ch/index.cfm?uuid=E34D435E99D6097F77CE8C5E0D49B1B2&type=search&show_long=1

Chiara Pivetta, first author of the publication, explains: “The motor command to the muscle is sent in two different directions – in one direction, to trigger the desired muscular contraction and in the other, to inform the brain that the command has actually been passed on to the musculature.” In analogy to e mail transmission, the information is thus not only sent to the recipient but also to the original requester.

Interestingly, the scientists only observed this kind of information flow to the brain for arm, but not for leg control. “What this shows,” says Arber, “is that this information pathway is most likely important for fine motor skills. Compared to the leg, movements of our arm and especially our hands have to be far more precise. Evidently, our body can only ensure this level of accuracy in motor control with constant feedback of information.”