Interesting facts about the brain of humans | [ Brain stem Brain cells ]

A brain is the portion of the central nervous system contained within the skull.

The brain is the control center for the movement, sleep, hunger, thirst and virtually every other vital activity necessary for survival. All human emotions ____ including love, hate, fear, anger, elation, and sadness are controlled by the brain. It also receives and interprets the countless signals that are sent to is form other parts of the body and form the external environment. The brain makes us conscious emotional and intelligent.

INTERESTING FACTS ABOUT THE BRAIN 

• There are 100 billion cells in your brain, each connected to as many as 25,000 others, so there are 25,000 times 100 billion nerve connection in your brain or two and a half million billion. 
• Girls brain weight, on average 2.5% of her body weight, Boy’s brain weight 2% of his weight. 
• The brain makes up under 2% of your body’s weight, yet demands over 25% of its blood supply.
• The membrane between brain cells and the blood supply is called the blood-brain barrier.
• The blood-brain barrier lets through only the finest particles, including glucose.
• The layout of the human brain and nervous system is much the same as other animals but the top of the brain, the cerebrum is much much bigger.

Anatomy:-

The adult human brain is a 1.3-kg mass of pinkish grey jellylike tissue make up of approximately 100 billion nerve cells or neurons;

1.  Neuroglia cells (Supporting Cells)
2.  Vascular (blood-carrying)
3.  Other cells

A network of work of blood vessels supplies the brain with vast quantities of oxygen and food that it

requires. The human brains make up only about 2% of the total body weight, but it uses about the 20% of the oxygen used by the entire body when at rest. The brain can go without oxygen for only three to five minutes before serious damage results.

The brain is at the upper end of the spinal cord. The spinal cord is a cable of nerve cells that extend from the neck about two third of the way down the backbone. The spinal cord carries a message between the brain and other parts of the body.

 The parts of the brain:

 The brain has three main divisions:

• The cerebrum
• The cerebellum
• The brain stem

Each part consists chiefly of nerve cells, called neurons and supporting cells called glia.

Cerebrum

Cerebrum makes up about the 85% of the weight of the human brain. A large groove called the longitudinal fissure divides the cerebrum into halves called the left cerebral hemisphere and the right cerebral hemisphere. The cerebellum coordinates body movements. Located at the lower back of the brain beneath the occipital lobes, the cerebellum is divided into two lateral lobes connected by a finger-like bundle of white fibres. The cerebellum coordinates voluntary movements by fine-tuning commands from the motor cortex in the cerebrum

Brain Stem

Brain Stem is responsible for sustaining the basic functions of life, such as breathing and blood pressure.

Brain Cells 

There are two main types of brain cells;

• Neurons are responsible for the transmission and analysis of all electrochemical communication within the brain and another part of the nervous system.
• Neuroglial Cells are twice as numerous as neurons and account for half of the brain’s weight.

How Does Brain Works? 

The brain functions by complex neuronal or nerve cell circuits. Communication between neurons is both electrical and chemical and always travels from the dendrites of neurons, through its soma and out its axon to the dendrites of other neurons. Dendrites of one neuron receive the signal from the axon of other neurons through chemical know as the neurotransmitter.