Learn About The Nervous System
Ranked #4,316 in Education, #104,455 overall
Millions of nerve signals enter your brain every single second of your life.
The nervous system is your body;s control and communication system, made up of nerves and the brain.
Nerves are your body hot-lines, carrying instant messages from the brain to every organ and muscle - and sending back an endless stream of data to the brain about what is going on both inside and outside your body.
The central nervous system is divided into two parts: the brain and the spinal cord. The average adult human brain weighs 1.3 to 1.4 kg (approximately 3 pounds). The brain contains about 100 billion nerve cells (neurons) and trillons of "support cells" called glia. The spinal cord is about 43 cm long in adult women and 45 cm long in adult men and weighs about 35-40 grams. The vertebral column, the collection of bones (back bone) that houses the spinal cord, is about 70 cm long. Therefore, the spinal cord is much shorter than the vertebral column.
Nerves are your body hot-lines, carrying instant messages from the brain to every organ and muscle - and sending back an endless stream of data to the brain about what is going on both inside and outside your body.
The central nervous system is divided into two parts: the brain and the spinal cord. The average adult human brain weighs 1.3 to 1.4 kg (approximately 3 pounds). The brain contains about 100 billion nerve cells (neurons) and trillons of "support cells" called glia. The spinal cord is about 43 cm long in adult women and 45 cm long in adult men and weighs about 35-40 grams. The vertebral column, the collection of bones (back bone) that houses the spinal cord, is about 70 cm long. Therefore, the spinal cord is much shorter than the vertebral column.
Another excellent book by Stille
![The Nervous System (True Books: Health) [Paperback]](http://ecx.images-amazon.com/images/I/518MK5WyFaL.jpg)
The Nervous System (True Books: Health)
Amazon Price: $3.34 (as of 06/04/2012)
There are simple diagrams of the eye, ear, nose, and tongue, and explanations about how nerves "like wires" carry messages to the brain.
The longest is the sciatic, which runs from the base ofthe spine to the knee.
The main branches of the PNS are the 12 cranial nerves in the head, and the 31 pairs of spinal nerves that branch off the spinal cord.
The nerves of the PNS are made up of long bundles of nerve fibers, which in turn are made from the long axons (tails) of nerve cells, bound | together Iike the wires in a telephone cable.
In many places, sensory nerves (which carry sense signals from the body to the brain) run
alongside motor nerves (which carry the brain's ^ commands telling muscles to move).
Some PNS nerves are as wide as your VI thumb. The longest is the sciatic, which runs from the base ofthe spine to the knee.
The nerves of the PNS are made up of long bundles of nerve fibers, which in turn are made from the long axons (tails) of nerve cells, bound | together Iike the wires in a telephone cable.
In many places, sensory nerves (which carry sense signals from the body to the brain) run
alongside motor nerves (which carry the brain's ^ commands telling muscles to move).
Some PNS nerves are as wide as your VI thumb. The longest is the sciatic, which runs from the base ofthe spine to the knee.
Human Body: An Illustrated Guide to Every Part of the Human Body and How It Works
Human Body: An Illustrated Guide to Every Part of the Human Body and How It Works
Amazon Price: $10.18 (as of 06/04/2012)
The autonomic nervous system (ANS) is the body's third nervous system.
The autonomic nervous system (ANS) is the body's third nervous system. It controls all internal body processes such as breathing automatically, without you even being aware of it.
The ANS is split into two complementary (balancing) parts - the sympathetic and the parasympathetic. The sympathetic system speeds up body processes when they need to be more active such as when the body is exercising or under stress. The parasym pathetic slows them down.
The ANS is split into two complementary (balancing) parts - the sympathetic and the parasympathetic. The sympathetic system speeds up body processes when they need to be more active such as when the body is exercising or under stress. The parasym pathetic slows them down.
The Brain: Our Nervous System
Did you know that your brain (yes, even yours) is roughly the size of a large grapefruit?
![The Brain: Our Nervous System [Paperback]](http://ecx.images-amazon.com/images/I/51KDZAJ6WFL.jpg)
The Brain: Our Nervous System [Paperback]
Grade 3-6. In this most recent effort, Simon brings his deft touch to an explanation of the brain and the nervous system. His clear, concise writing style is complemented by stunning color images taken with radiological scanners, such as CAT scans, MRIs, and SEMs (scanning electron microscopes.) Included in his explanation are descriptions of the anatomy and function of the parts of the brain, long and short term memory, neurons, dendrites, and more.
A human being has a nervous system with about 60 billion nerve cells. A spider has about 100,000.
Table of Contents
- Another excellent book by Stille
- The longest is the sciatic, which runs from the base ofthe spine to the knee.
- Human Body: An Illustrated Guide to Every Part of the Human Body and How It Works
- The autonomic nervous system (ANS) is the body's third nervous system.
- The Brain: Our Nervous System
- Text module
- Text module
- Flickr Photos
- Text module
by jeffryv
Feeling creative?
Create a Lens!
Explore related pages
- Learn About The Human Body Learn About The Human Body
- Learn About the Human Skeleton Learn About the Human Skeleton
- Learn About The Human Circulatory System Learn About The Human Circulatory System
- Learn About Snails and Slugs Learn About Snails and Slugs
- Learn About The Human Endocrine System Learn About The Human Endocrine System
- Learn About the Respiratory System Learn About the Respiratory System
