One eleven perioreceptors that detect blood pressure, temperature and heart rate are located at the top of the brain.
Each one of these receptors is connected to a nerve bundle that runs from the front of the head to the back of the neck.
They are called the perioperative and periasthenic nerves.
The periosteric nerve runs to the front and back of each leg.
Each perioperatively connected nerve connects to an axon in the brain stem.
Each axon has an area called a nucleus.
When you feel a sensation in the back or back of your neck, you can connect the nucleus to one of the periopolar nerves and the nucleus of the spinal cord to another.
That nerve then makes a connection to a synapse that forms a pathway in the spinal column.
When the nerve gets strong enough, it connects to a new synapse in the same spinal cord.
The connection between the synapse and the axon can make the sensation feel like it is happening right next to you.
The nerve can also make the connection to the spinal pole, where it can cause pain or inflammation.
This is the way the pericortical nerves work.
This article is adapted from the book The Perioperative Network: How to Reduce Pain and Inflammation, by Dr. John R. Dutton, MD, M.D.