If you hit your thumb with a hammer, these wires in your arm -- that, of course, we call nerves -- transmit the information into the junction box in the spinal cord where new wires, new nerves, take the information up to the brain where you become consciously aware that your thumb is now hurt.
Se pegas cun martelo no polgar, estes cables do brazo --chamados nervios-- transmiten a información á caixa de conexións na medula espiñal onde novos cables, novos nervios, levan a información ata o cerebro, que é cando te das conta  de que magoaches o polgar.