The human nervous system Part 1 Forebrain
Our nervous system is responsible for controlling all the functions of the body. It is a super computer and demonstrates multitasking at its best.
It is divided into central and peripheral parts. The central part consists of the brain situated inside the skull and the spinal cord contained in the vertebral column.
The peripheral part in turn consists of the twelve pairs of cranial nerves and thirty one pairs of spinal nerves. These nerves innervate every part of the body receiving sensory information and also sending the commands from the brain.
There is another part of this system called the autonomic nervous system. This part is responsible for controlling the involuntary functions of the body like activity of the heart, lungs, maintaining blood pressure, secretion of the glands etc.
The brain sets man apart from other animals. While in all other animals it accounts for less than 1 percent of the total body weight, in man it accounts for 2 percent of the body weight (about 1300 grams).
The human brain is estimated to contain approximately one hundred billion nerve cells which are called neurons. It is covered by three layers called meninges which also cover the spinal cord. The outer most layer is called dura mater and is a tough fibrous membrane.