Tuesday, May 10, 2022

Is The Brain Considered An Organ

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What Does The Brain Do

Surprising Realities of Brain Death and Organ Donation Part 1

The brain controls what you think and feel, how you learn and remember, and the way you move and talk. But it also controls things you’re less aware of like the beating of your heart and the digestion of your food.

Think of the brain as a central computer that controls all the body’s functions. The rest of the nervous system is like a network that relays messages back and forth from the brain to different parts of the body. It does this via the spinal cord, which runs from the brain down through the back. It contains threadlike nerves that branch out to every organ and body part.

When a message comes into the brain from anywhere in the body, the brain tells the body how to react. For example, if you touch a hot stove, the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away. Luckily, this neurological relay race happens in an instant.

Anatomy Of The Brain And Spine

Learn more about the anatomy and the functions of the brain and spine

The brain and spine are vital to keep the body alive and functioning. Everything we do depends on the messages that are sent from the brain, along the spinal cord and on to the rest of the body.

How Much Does A Human Brain Weigh

The human brain weighs about 3 lbs. and makes up about 2% of a human’s body weight. On average, male brains are about 10% larger than female brains, according to Northwestern Medicine in Illinois. The average male has a brain volume of nearly 78 cubic inches , while the average female brain has a volume of 69 cubic inches . The cerebrum, which is the main part of the brain located in the front area of the skull, makes up 85% of the brain’s weight.

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The Architecture Of The Brain

The brain is like a committee of experts. All the parts of the brain work together, but each part has its own special properties. The brain can be divided into three basic units: the forebrain, the midbrain, and the hindbrain.

The hindbrain includes the upper part of the spinal cord, the brain stem, and a wrinkled ball of tissue called the cerebellum . The hindbrain controls the bodys vital functions such as respiration and heart rate. The cerebellum coordinates movement and is involved in learned rote movements. When you play the piano or hit a tennis ball you are activating the cerebellum. The uppermost part of the brainstem is the midbrain, which controls some reflex actions and is part of the circuit involved in the control of eye movements and other voluntary movements. The forebrain is the largest and most highly developed part of the human brain: it consists primarily of the cerebrum and the structures hidden beneath it .

When people see pictures of the brain it is usually the cerebrum that they notice. The cerebrum sits at the topmost part of the brain and is the source of intellectual activities. It holds your memories, allows you to plan, enables you to imagine and think. It allows you to recognize friends, read books, and play games.

Major Organs Of The Body

How Inflammation Makes You Fat And Slows Your Brain (Part ...

As discussed above, all 78 organs are important as they are associated with the specialized functions in our body. There are a few organs, which are very much essential for the survival of an individual, therefore, they are called the major or vital organs of the body. These organs are the hardest working organ in the human body, which functions 24 x 7.

Brain

It is the most complicated organ in our body. The human brain is located in our head and is surrounded by a strong bony structure, called the skull and is suspended in a layer of fluid called the cerebrospinal fluid, which functions by protecting the brain from minor mechanical shocks and jolts. The brain, along with the spinal cord, composes the central nervous system. It is responsible for thoughts, interpretation, regulation and control of body movements.

Refer more: Human Brain

Heart

Refer more:Human heart

Lungs

Humans have a pair of lungs, which are situated within the thoracic cavity of the chest. Lungs play a major role in the respiratory system. In humans, a pair of lungs are structured in such a way that it facilitates the exchange of gases. They are lined by a thin membrane, the presence of bronchioles the smaller tubes, alveoli a balloon-like structure and the group of blood capillaries, which expands the surface area for the exchange of gases.

Refer more:Human Respiratory System

Pancreas

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Kidneys

Refer more:Human Excretory System

Refer more:Structure of an eye

Small intestine

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How Hungry Are Our Brains

Despite the fact that the human brain is not a very large organ, its functioning requires a whole lot of energy.

Although the brain weighs only 2 percent of the body , it alone uses 25 percent of all the energy that your body requires to run per day, Herculano-Houzel explained in a presentation.

And why does the brain need so much fuel? Based on studies of rat models, some scientists have hypothesized that, while most of this energy is expended on maintaining ongoing thought and bodily processes, some of it is probably invested in the upkeep of brain cells health.

But, according to some researchers, at first sight, the brain, seemingly inexplicably, uses up a lot of energy during what is known as the resting state, when it is not involved in any specific, targeted activities.

According to James Kozloski, Inactivity correlated networks appear even under anesthesia, and these areas have very high metabolic rates, tipping the brains energy budget toward a large investment in the organisms doing nothing, he writes.

But Kozloskis hypothesis is that no large amount of energy is spent for no reason so why does the brain seem to do it? In fact, he says, it doesnt.

Energy spent doing nothing, he says, is actually put toward assembling a map of accumulating information and experiences that we can fall back on when making decisions in our day-to-day lives.

The Cerebellum: Back Of The Brain

Behind the cerebrum at the back of the head lies the cerebellum. In Latin, cerebellum means little brain, but the cerebellum actually contains more nerve cells than both hemispheres combined. The cerebellum is primarily a movement control center, responsible for:

  • Voluntary muscle movements
  • Fine motor skills
  • Maintaining balance, posture & equilibrium

Unlike the cerebrum, the left cerebellum controls the left side of the body, and the right cerebellum controls the right side of the body.

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Largest Organs In The Human Body

Based on the weight and the length of the body organs, they are classified as the longest organs in the human body. These organs are macroscopic and are involved in multiple functions.

Altogether, there are 10 large organs in the body, which include skin, liver, brain, lungs, heart, kidney, spleen, pancreas, thyroid and joints. A few of them are explained in detail below.

Skin

Skin is the largest external organ of the human body. It is a vital organ and provides outer covering, which protects from external elements. It also functions by protecting our internal organs from invading pathogens, regulates our body temperature and pH, prevents dehydration and also functions as the main sense organ. In both animals and humans, skin functions as a barrier between the outside and inside the environment. The skin acquires an area of 19 to 20 square feet on our body surface. Therefore, it is called the largest external organ of the human body.

Refer More:Structure and function of the skin

Liver

The liver is the largest internal organ in the human body, which weighs between 1.3 to 1.5 kg. The liver is located in the upper right portion of the abdomen and is the organ found only among the vertebrates. It is triangular, bilobed in structure and performs more than 500 functions, including blood clotting, protecting from the invading pathogens, synthesis of hormones and proteins and secretes various enzymes and chemicals.

Explore More: Largest organs in the human body

What Happens When You Exercise Your Brain

Dissecting Brains

Exercising your brain using cognitive training tools, which are also called brain training games or brain exercises, may help improve your cognitive functioning.

Some studies have found that brain exercises improve memory, executive functions, and processing speeds, while others have shown little to no effect.

The impact of brain exercises may have something to do with age. Some studies have shown an improvement in cognitive abilities in young people and older adults. Nouchi R, et al. . Brain training game boosts executive functions, working memory and processing speed in the young adults: A randomized controlled trial. DOI: 10.1371/journal.pone.0055518

Brain exercises may also be beneficial in slowing age-related changes in the brain and those associated with neurological conditions, such as Alzheimers disease and dementia.

A study published in 2017 showed that a brain-training intervention known as speed-of-processing training significantly reduced dementia risk. Edwards JD, et al. . Speed of processing training results in lower risk of dementia. DOI: 10.1016/j.trci.2017.09.002

If youre looking to exercise your brain, you dont necessarily need to resort to brain training games and apps.

Your brain is made up of different parts that all work together. Lets take a look at the different parts of the brain and what they do.

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Is Your Brain A Muscle

No matter what you’re doing, your brain is almost always getting a workout.

School work. House work. Work work. Driving in traffic. Watching TV. Running errands. Playing a board game. Deciding what to eat for dinner. Keeping up with a conversation. Remembering where you parked your car.

You rely on your brain for, well, everything.

You lean on it so much that it’s no surprise that your brain feels like a muscle one you flex throughout the day.

What Makes A Brain

The human brain makes up, alongside the spinal chord, the central nervous system. The brain itself has three main parts:

  • the brainstem, which, like a plants shoot, is elongated, and which connects the rest of the brain with the spinal chord
  • the cerebellum, which is located at the back of the brain and which is deeply involved in regulating movement, motor learning, and maintaining equilibrium
  • the cerebrum, which is the largest part of our brains and fills up most of the skull it houses the cerebral cortex and other, smaller structures, all of which are variously responsible for conscious thought, decision-making, memory and learning processes, communication, and perception of external and internal stimuli

Brains are made of soft tissue, which includes gray and white matter, containing the nerve cells, non-neuronal cells , and small blood vessels.

They have a high water content as well as a large amount of fat.

The brain of the modern-day human Homo sapiens sapiens is globular, unlike the brains of other early hominids, which were slightly elongated at the back. This shape, research suggests, may have developed in Homo sapiens about 40,00050,000 years ago.

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Summary Brain Vs Cerebrum

Brain is the main organ which controls all functions of our body. It is a part of the central nervous system and located inside the skull. Skull protects the brain from injuries. There are five major components of the brain. There are also two types of cells neurons and glial cells which are responsible for signal transmission throughout the body. Cerebrum is the uppermost and largest part of the brain which divides into two left and right symmetrical hemispheres. It is responsible for the higher mental functions of the body such as thinking, reasoning, memory, consciousness, emotion, etc. This is the difference between brain and cerebrum.

Skin Is Part Of The Integumentary System

ð? The brain is a solid organ that lacks cavities. The ...

Skin is also the foundation of the integumentary system. This system incorporates your hair, nails, and specialized glands and nerves. It is made up of three layers: the epidermis, dermis, and hypodermis. Its thickness varies from 0.5 millimeters at its thinnest and up to 4 millimeters at its thickest.

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Right Brain Left Brain

The cerebrum is divided into two halves: the right and left hemispheres They are joined by a bundle of fibers called the corpus callosum that transmits messages from one side to the other. Each hemisphere controls the opposite side of the body. If a stroke occurs on the right side of the brain, your left arm or leg may be weak or paralyzed.

Not all functions of the hemispheres are shared. In general, the left hemisphere controls speech, comprehension, arithmetic, and writing. The right hemisphere controls creativity, spatial ability, artistic, and musical skills. The left hemisphere is dominant in hand use and language in about 92% of people.

Introduction: The Human Brain

A false-colour Magnetic Resonance Image of a mid-sagittal section through the head of a normal 42 year-old woman, showing structures of the brain, spine and facial tissues

The brain is the most complex organ in the human body. It produces our every thought, action, memory, feeling and experienceof the world. This jelly-like mass of tissue, weighing in at around 1.4 kilograms, contains a staggering one hundred billion nerve cells, or neurons.

The complexity of the connectivity between these cells is mind-boggling. Each neuron can make contact with thousands or even tens of thousands of others, via tiny structures called synapses. Our brains form a million new connections for every second of our lives. The pattern and strength of the connections is constantly changing and no two brains are alike.

It is in these changing connections that memories are stored, habits learned and personalities shaped, by reinforcing certain patterns of brain activity, and losing others.

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The Cranium: Covering Of The Brain

The brain is protected by a bony covering called the cranium. The cranium and the bones of the face make up the skull. Inside the cranium, the brain is surrounded by three layers of tissue called the meninges. The meninges include:

  • Pia mater: The layer closest to the surface of the brain
  • Arachnoid membrane: The middle layer of tissue
  • Dura mater: The outer-most layer

Headaches Are Caused By A Chemical Reaction

Nervous Tissue || Structure II 3D Animation Video

Chemical activity in your brain, the nerves or blood vessels surrounding your skull, or the muscles of your head and neck can play a role in primary headaches. Serotonin is a chemical necessary for communication between nerve cells. When serotonin or estrogen levels change, the result for some is a headache or migraine. Serotonin levels may affect both sexes, while fluctuating estrogen levels affect women only.

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How Many Brain Cells Does A Human Have

The human brain contains about 86 billion nerve cells called “gray matter,” according to a 2012 study published in the Proceedings of the National Academy of Sciences. The brain also has about the same number of non-neuronal cells, such as the oligodendrocytes that insulate neuronal axons with a myelin sheath. This gives axons a white appearance, and so these axons are called the brain’s “white matter.”

Is The Brain A Muscle The Truth About The Brain

Is the brain an organ? Or is it a muscle? And does it need to be trained and maintained?

Oh, the burning questions! Whether its a myth or a persistent metaphor, there is a common belief that the brain is a muscle.

The belief that the brain is a muscle may have stemmed from the phrase exercise your brain or your brain is like a muscle. And although it makes sense as a metaphor, the reality that science teaches us tells a different story.

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Pounds Of Remarkable Matter

Made up of billions of neurons that communicate in trillions of connections called synapses, your brain is one of the most complex and fascinating organs in your body. Keeping your brain healthy and active is vital. Discover just how powerful it is with these interesting facts.

  • Sixty percent of the human brain is made of fat. Not only does that make it the fattiest organ in the human body, but these fatty acids are crucial for your brains performance. Make sure youre fueling it appropriately with healthy, brain-boosting nutrients.
  • Your brain isn’t fully formed until age 25. Brain development begins from the back of the brain and works its way to the front. Therefore, your frontal lobes, which control planning and reasoning, are the last to strengthen and structure connections.
  • Your brains storage capacity is considered virtually unlimited. Research suggests the human brain consists of about 86 billion neurons. Each neuron forms connections to other neurons, which could add up to 1 quadrillion connections. Over time, these neurons can combine, increasing storage capacity. However, in Alzheimers disease, for example, many neurons can become damaged and stop working, particularly affecting memory.
  • Brain information travels up to an impressive 268 miles per hour. When a neuron is stimulated, it generates an electrical impulse that travels from cell to cell. A disruption in this regular processing can cause an epileptic seizure.
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    How Does The Nervous System Work

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    The basic workings of the nervous system depend a lot on tiny cells called neurons. The brain has billions of them, and they have many specialized jobs. For example, sensory neurons send information from the eyes, ears, nose, tongue, and skin to the brain. Motor neurons carry messages away from the brain to the rest of the body.

    All neurons relay information to each other through a complex electrochemical process, making connections that affect the way you think, learn, move, and behave.

    Intelligence, learning, and memory. As you grow and learn, messages travel from one neuron to another over and over, creating connections, or pathways, in the brain. It’s why driving takes so much concentration when someone first learns it, but later is second nature: The pathway became established.

    In young children, the brain is highly adaptable. In fact, when one part of a young child’s brain is injured, another part often can learn to take over some of the lost function. But as you age, the brain has to work harder to make new neural pathways, making it harder to master new tasks or change set behavior patterns. That’s why many scientists believe it’s important to keep challenging the brain to learn new things and make new connections it helps keeps the brain active over the course of a lifetime.

    The Senses

    Smell. Olfactory cells in the mucous membranes lining each nostril react to chemicals you breathe in and send messages along specific nerves to the brain.

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