The Mysteries of Human Brain [1/3]

The human brain is the center of the human nervous system and is a highly complex organ. It has the same general structure as the brains of other mammals, but is over five times as large as the "average brain" of a mammal with the same body size.[citation needed] Most of the expansion comes from the cerebral cortex, a convoluted layer of neural tissue that covers the surface of the forebrain. Especially expanded are the frontal lobes, which are involved in executive functions such as self-control, planning, reasoning, and abstract thought. The portion of the brain devoted to vision is also greatly enlarged in humans.

Brain evolution, from the earliest shrewlike mammals through primates to hominids, is marked by a steady increase in encephalization, or the ratio of brain to body size. The human brain has been estimated to contain 50100 billion (1011) neurons[citation needed], of which about 10 billion (1010) are cortical pyramidal cells.[citation needed] These cells pass signals to each other via around 100 trillion (1014)[citation needed] synaptic connections.

In spite of the fact that it is protected by the thick bones of the skull, suspended in cerebrospinal fluid, and isolated from the bloodstream by the blood-brain barrier, the delicate nature of the human brain makes it susceptible to many types of damage and disease. The most common forms of physical damage are closed head injuries such as a blow to the head, a stroke, or poisoning by a wide variety of chemicals that can act as neurotoxins. Infection of the brain is rare because of the barriers that protect it, but is very serious when it occurs. More common are genetically based diseases[citation needed], such as Parkinson's disease, multiple sclerosis, and many others. A number of psychiatric conditions, such as schizophrenia and depression, are widely thought to be caused at least partially by brain dysfunctions, although the nature of the brain anomalies is not very well understood.

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[thangQanime]

Man, I've always thought the brain was the most awesome part of the human body but then again...look at what's TELLING me that.

[idiotkrati]

I want to eat that brain...is it wrong?

[ThisisNickyBMusic]

eugene levy?

[Bennyboy138]

This so awesome!....I'd urge everyone to find out/read about/watch clips about a part of our brains called the Pineal Gland. When i first heard about its potential function i was truly amazed :)

[SadDepressedClown]

jelly

[cuteulala1]

billions of brains and access to em and we even do sience inside em but we study and have a hard time knowing how it works lmao

[JG129]

@idiotkrati Yes , very much so !!!

[teacherteya]

@TheMsElden Look in MyPlanett's uploads. Just click on his/her username.

[Dolphidood]

Who is that guy that I keep seeing who's like a posh Mario?