The nervous system is basically the body’s electrical wiring with electrical signals being sent to and from the brain. The nervous system is made up of two parts which are the central nervous system (the brain and spinal cord) and the peripheral nervous system (everything else). The peripheral nervous systems job is to connect the central nervous system with the rest of the body therefore allowing our brain to send and receive signals.
There are many interesting facts about the nerves but these are a few that I find very interesting and I hope that you do too. Next time you are visiting us here in Eastbourne ask your chiropractor to show you the nerve chart.
Nerve facts in numbers
- There are more nerve cells in the human body than the number of stars in the Milky Way.
- 100 billion neurones make up the human brain and if these were to be lined up would measure 600 miles long.
- In a foetus, neurones grow at 250,000 neurones per minute.
- 5 million neurones make up the spinal cord with the cluster of nerves at the base being the most sensitive.
- To connect the central nervous system to the rest of the body there are 43 different pairs of nerves. 12 pairs come out from the brain (protected by the skull) and the other 31 from the spinal cord (protected by the spine).
- Messages sent to the brain can travel as fast as 180 miles per hour.
- During the course of its first year a baby’s brain will grow to almost three times the size at birth.
- Because of the shape of the brain the total surface area is about 25,000 square centimetres.
- The brain of a man, on average, weighs around 100g more than that of a woman.
- The brain of a fully-grown adult is approximately three times as heavy as that of a newborn baby however, after the age of 20, we lose 1g in weight every year.
Miscellaneous Nerve facts
- Due to an area at the top of the neck the left side of the brain controls the right side of the body and the right side of the brain the left side of the body.
- The brain and spinal cord begin to develop in a foetus three weeks after conception.
- Most of the brain, at any given point, is inactive and resting with only 4% of the cells active at any moment in time.
- It has been estimated that 12% of people dream in black and white. This is believed to be due to watching black and white television as most of these people are over 55.
- When blind people dream, whether they dream in picture is down to whether they could see when they were born or were born blind. If they were born blind dreams would typically consist of different senses such as sound, smell, taste and touch.
The study of the nervous system is called neuroscience. Nerves can be very sensitive and are susceptible to physical injury and injury through disease. This can lead to severe pain, tingling, numbness and weakness. One of the most common injuries to nerves occurs to the sciatic nerve and this is often accompanied by severe pain down the back of the leg with tingling and numbness in the foot and often weakness also. This kind of injury generally only effects one side and can be due to a multitude of things. One of the most common is a disc injury in the lower spine (slipped disc).
Look out for my next blog on interesting facts about bones.
Yours in health,
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