The first process is when nerves in the skin sense something harmful and communicate that information to the spinal cord. There the motor neurons activate movements that cause us to react; this is the physical recognition of harm known as nociception. Nearly all animals even those with simple nervous systems experience it because without it animals would be unable to avoid harm and their survival becomes threatened . The second process is called conscious recognition. In humans, this will occur when the sensory neurons in our skin make a second round of connections via the spinal cord to the brain. There are millions of neurons in numerous regions that will create the sensation of pain. For humans this experience is very complex and allowing
