Definition: Defining the Meaning of Human Brain
The brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses. Our brain gives us awareness of ourselves and of our environment, processing a constant stream of sensory data. It controls our muscle movements, the secretions of our glands, and even our breathing and internal temperature. The human brain has the same general structure as the brains of other mammals, but has a more developed cerebral cortex than any other. Large animals such as whales and elephants have larger brains in absolute terms, but when measured using the encephalization quotient, which compensates for body size, the human brain is almost twice as large as the brain of a bottle-nose dolphin, and three times as large as the brain of a chimpanzee - See Definitions of Human Brain Components.
The human brain is the center of the human nervous system. Enclosed in the cranium, it has the same general structure as the brains of other mammals, but is over three times as large as the brain of a typical mammal with an equivalent body size.
The human brain is the center of the nervous system in animals. All vertebrates, and the majority of invertebrates, have a brain.
The brain has the size and appearance of a small cauliflower. But thanks to its 100 billion nerve cells, we can think, plan, talk, imagine, and so much more.
The brain has two cerebral hemispheres.
Each takes care of one side of the body, but the controls are crossed: the right hemisphere takes care of the left side, and vice versa.
If each hemisphere were unfolded, it would be the size of an extra-large pizza! For this reason, the brain must fold over on itself many times to fit into the skull.
The brain monitors and regulates the body's actions and reactions.
It continuously receives sensory information, and rapidly analyzes this data and then responds, controlling bodily actions and functions.
The brainstem controls breathing, heart rate, and other autonomic processes that are independent of conscious brain functions.
The neocortex is the center of higher-order thinking, learning, and memory.
The cerebellum is responsible for the body's balance, posture, and the coordination of movement.
The human brain controls the central nervous system by way of the cranial nerves and spinal cord, the peripheral nervous system and regulates virtually all human activity.
The human brain is made up of over 100 billion nerve cells with each brain cell connected to around 10,000 other cells, which equals around 1000 trillion connections in your brain.
The brain can be divided into three basic units:
- the forebrain,
- the midbrain,
- the hindbrain.
Studies of the Human Brain:
For centuries, scientists and philosophers have been fascinated by the brain, but until recently they viewed the brain as nearly incomprehensible. Now, however, the brain is beginning to relinquish its secrets.
Scientists have learned more about the brain in the last 10 years than in all previous centuries because of the accelerating pace of research in neurological and behavioral science and the development of new research techniques. As a result, Congress named the 1990s the Decade of the Brain.
At the forefront of research on the brain and other elements of the nervous system is the National Institute of Neurological Disorders and Stroke (NINDS), which conducts and supports scientific studies in the United States and around the world.
Glossary of words used to define various parts and actions relating to the human brain.
There are more named components to the human brain than you may think, as per usual medical naming most of the glossary of terms used to describe parts of the brain are from Latin.
Quick Facts: Brain
Q - How much oxygen does the brain need to stay "conscious"
A - An adults brain requires around 20% of the body's oxygen.
Q - How much blood is needed by the brain
A - Approximately 20% of the blood flowing from the heart is pumped to the brain. The brain needs constant blood flow in order to keep up with the heavy metabolic demands of the neurons.
Q - Does the brain work at the Speed of Light
A - No, far from it.. View the full list of Human Brain Facts.
Statistics: Human Brain
- Water - The brain is made up of about 75% water.
- Skin - Your skin weighs twice as much as your brain.
- Weight - The weight of the human brain is about 3 lbs.
- Neurons - Your brain consists of about 100 billion neurons.
- Gray and white - Your brain is 60% white matter and 40% gray matter.
- Blood vessels - There are 100,000 miles of blood vessels in the brain.
- No pain - There are no pain receptors in the brain, so the brain can feel no pain.
- Synapses - There are anywhere from 1,000 to 10,000 synapses for each neuron.
- The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.
- Fat - The human brain is the fattest organ in the body and may consists of at least 60% fat.
- Gray matter - The brain's gray matter is made up of neurons, which gather and transmit signals.
- Cerebrum - The cerebrum is the largest part of the brain and makes up 85% of the brain's weight.
- White matter - The white matter is made up of dendrites and axons, which create the network by which neurons send their signals.
- Einstein's brain was similar in size to other humans except in the region that is responsible for math and spatial perception. In that region, his brain was 35% wider than average.
- Largest brain. While an elephant's brain is physically larger than a human brain, the human brain is 2% of total body weight (compared to 0.15% of an elephant's brain), meaning humans have the largest brain to body size.