White matter?

Question

Can someone tell me, what is the electrical current of the brain is?

Answer 1

Maximum peak sodium current (which initiates the Action potential) in mammals is around 1 nA (nano amp). There are approximately 100 billion neurons in the brain, but they do not fire at the same time. The highest rate of firing would be during an epileptic attack, which is characterized by uncontrolled firing of neurons.

If you are asking what types of current are involved, the three major ions are sodium, potassium and calcium.

Answer 2

Chewy chim does not have a clue, hahaha!
Any way, in the brain you have specific brain regios which contain nuclei with clustures of cell bodies. sometimes in area such as the cortex this is a large area. The cell bodies communicate with each other and other brain regions via axons. These axons are mylinated (white matter) which helps signal transittion. Its like plastic around a copper wire.

Elictrical current through out the CNS is ver complex. The summerize it involves a threshhold of exitation being met at the cell body which causes activity along the axon which feed into other neurons at synapses by chmical communication. The electrical activity is due to depolarization. At rest the neuron has more K+ on th inside and more Na+ on th outside. When the threshols is met there is a large influx of Na+ in comparisson to the small eflux of K+ causing a net depolarisation, leading to siganl transition.

Many protein channels and pumps are involved with many internal protein activity, transcrition...............long story and needs many diagrams.

Small nodes in the middle of the mylin allow the signal to jump along the axon.

Answer 3

Sara N has given a good description of the action in the brain at the level of the neuron. The critical piece of info that was left out, however, is the charge. The resting potential (electrical charge) prior to the neuron firing is negative 60 - negative 70 mV.

Answer 4

In the brain, white matter is found everywhere except for the cortex, since the cortex consists of gray matter. White matter is composed of the axons of nerve cells while gray matter are the cell bodies (soma). In the spinal cord however, the location of white and gray matter is reversed (white matter is on the outside while gray matter is on the inside).

I'm not sure what you mean by the electric current of the brain...

Answer 5

The brain can conduct electrical current but it is not significantly high for any purpose outside the propagation of biosignals. Any higher and the nerve fibers will be destroyed. A textbook puts the amount necessary to open membrane channels at 0.4mV.

Answer 6

Dont listen to chewychim. There is such a thing as white matter (and grey matter). White matter generally is the part of the brain and spinal cord responsible for information transmission via axons.

Answer 7

Schwann Cells surrond the nerve fiber and appear whitish, and fatty. Myelin sheath = white matter. Myelin sheath increase the speed of transmission of electrical nerve impules because between each schwann cell there is a node thus the impulse will "jump" from one node to the next.

Answer 8

sweetheart are you drunk or asking a true question ? I am sure you will find the answer somewhere but not on here we all thickies. Why not go on net and ask a brain surgeon.

Answer 9

action potential. sodium in and potassium out.

Answer 10

CLIVE C I saw you on the news today...!!
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