Cool facts about nerves!

Greetings Science Explorers! This week I have some neat facts about nerves for you!

• Nerves live as long as we do, they don't reproduce, grow, and die the same way other cells do. When you die, you will die with the same nerve cells you were born with! (To put this in perspective, you more or less have completely replaced all your skin cells every 28ish days)
• We can increase the density of the white matter in our brain and white matter increases ability of nerves to fire. The white matter in your brain is called myelin, and it insulates the majority of your nerves. (Specifically the axon portion of your nerve)
• You can rewire good and bad experiences based on the myelin sheath, more you reinforce something the more myelin gets around that axon, the stronger the reinforcement. So to rewire a negative experience you have to reroute that to a positive experience and reinforce the myelin in the new route. You can essentially re-program your brain and override things like fears and anxieties by giving those experiences different context and then re-enforcing the new context.
• If you attach emotion to an experience you will remember it much better. Positively celebrate when you learn to help you remember better.
• Our endocrine system is slower than nerve signals, so that's why adrenaline spike can hit after a "fight or flight" event is over. Further, males and females bodies process adrenaline much differently. 
• There are different types of nerves which carry different signals. We have afferent and efferent nerves which send information to the brain or receive information from the brain. We have motor nerves which tell our muscles what to do and we have sensory nerves which carry information about the world around us to our brains. One type of sensory nerve is one that carries pain signals to our brain. These pain nerves are slower than non pain nerves as they are very poorly myelinated or not mylinated at all. This means that can be potentially very easy to override the pain transmission to your brain by activating a more myelinated neruo pathway or inputting a stronger sensation further up the chain.