Brain: Structure and Function
© Jupiterimages / Hemera
The brain (cerebrum) of man weighs 1,400 grams on average - depending on gender and body size. With this relatively low mass, it controls nearly all vital body functions, allows thinking, emotional experience, and many other processes. Between the weight of the brain of a healthy person and his intelligence is no relationship.
The brain must be protected particularly from injury. This ensures the skull bone and shell and buffer structures which act as a shock absorber.
The brain processes sensory impressions, coordinates the functions of the body and keeps it upright. Prerequisite: billions of brain nerve cells (neurons, charming conducting cells) have to constantly communicate with each other and exchange information. This is done through electrical impulses.
The brain consists of two halves (Hemispheres), which are connected to each other by the so-called beams (corpus callosum). 80 percent of brain mass is attributable to the cerebrum.
The different services provides the brain in each case specifically responsible for brain regions. These regions correspond to certain areas of the brain, which can also be duplicated on the basis of anatomy. Certain cell groups and areas are responsible for different tasks.
Simplistically, the brain can in
The brain activity Scientists can visualize some reference to the accompanying metabolic processes. This is possible, for example, by observing the oxygen or glucose consumption of the brain. This is about functional studies of the cerebral (by: cerebrum) metabolism. The brain can be examined such as using positron emission tomography (PET) or functional magnetic resonance imaging (MRI).
In addition, the brain waves from the outside can be through the skin in the form of EEG derived (electroencephalogram).
The central nervous system (CNS) consists of two major parts: Set in the head brain and the Spinal cord. The brain is surrounded by the skull bones and inside the skull of three meninges (meninges). In this solid shell it floats to a certain extent in the cerebrospinal fluid, the cerebrospinal fluid. It protects the brain from injury and shock.
The brain consists of nerve cells, so-called glial cells (Support and supply tissue) and blood vessels together. Inside the brain are also filled with cerebrospinal fluid cavities: the so-called brain chambers or ventricles.
The ventricles are in communication with the outer CSF spaces. The spinal cord is surrounded by cerebrospinal fluid. Since all CSF spaces are interconnected and the liquor therein circulated the doctor can win Liquor brain for examination by inserting a needle (puncture) in the amount of the lumbar spine.