PAG full form in medical term is Periaqueductal Gray. The Periaqueductal Gray (PAG) is a group of nerve cells located in the middle of the brain, near a channel that connects different parts of the brain. The PAG is like a control center for many different processes in our body. One of the most important things that the PAG does is help us deal with pain. It does this by sending signals to the spinal cord to either increase or decrease the amount of pain we feel. For example, if you accidentally touch something hot, your PAG might send signals to your spinal cord to decrease the amount of pain you feel, so you can react quickly and move your hand away.
The PAG is also involved in regulating our body’s response to stress. It can send signals to different parts of the brain to help us react to stressful situations, such as when we’re in danger. This might include increasing our heart rate, making us feel more alert, and helping us decide whether to fight, run away, or freeze. It also plays a role in regulating our emotions. For example, it’s involved in the “freeze” response that animals sometimes have when they’re scared. This might involve making us feel numb or paralyzed so that we don’t move and draw attention to ourselves.