Are nerve cells/ brain cells renewed?

Question

it takes 8 to 7 years for all the cells in your body to be renewed. my question is if this includes your brain and nerve cells. thanks.

Answer 1

Just last week NS had an article on cell renewall http://www.newscientist.com/channel/health/mg19025561.900.html you must be a member in order to read the whole article but I'll copy here the preview and a related quotes

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Your amazing regenerating body

* 17 June 2006
* Gaia Vince
* Magazine issue 2556

How long does it take to completely renew your body, and what's left at the end of it? New Scientist investigates

HERE'S a question: how old are you? Think carefully before you reply. It's a lot trickier than you might imagine. The correct answer, it turns out, is about 15 and a half. According to recent research, that's the average age of your body - your muscles and guts, anyway. You might think that you have been around since the day you were born, but most of your body is a lot younger.

That may come as no surprise. It's a common belief that the human body completely renews itself every seven years, and though biologists would hesitate to put a firm figure on it most are happy to accept that cells eventually wear out and are replaced. In some tissues - skin and blood - we know how long it takes, for example from seeing how long transfused blood cells last. Surprisingly, however, we have no idea how often most ...


... in 1999 a study in Science caused great excitement with the claim that new growth had been found in the cerebral cortex of monkeys. Despite numerous attemps, however, the results have never been repeated.




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basically it expands on 'hockeyislife's response.

hope that helps.

Answer 2

The topic of brain cell regeneration is still being debated in the scientific community. Neuroscience dogma says the cells within your nervous system do not regenerate - you are born with all the brain cells to last your life time. Recent finding, however, shows that they can and do regenerate.

It is actually incorrect to say that it takes 7-8 years for all your cells in your body to be renewed. Cells within some organ constantly regenerate in as little as 3-5 days. For example, you are constantly shedding skin cells. There are other cells that only regenerate when they are injured. For example, if you donate half of your liver, it will regenerate itself in 8 months. And there are cells that don't regenerate at all. For example, your spinal cord will not regrow if severed.

Answer 3

No, brain cells are gone once they are gone, and since your brain is the center of your nervous system, nerve cells cannot be renewed, but, say for instance, the nerve cells in your hand, or legs, are damaged, if the situation is dire enough, you can amputate them, and be able to use a hand, or your legs!

Answer 4

Cells in different tissues are replaced at different rates, as others noted.

The "dogma" has long been that brain neurons are not replaced. However, this is not strictly true; some types are replaced, and this rate is affected by antidepressant drugs, and this may be involved in depression:

See this search:

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=RNWE,RNWE:2004-20,RNWE:en&q=antidepressant+neurons+brain

eg:

http://www.biopsychiatry.com/newbraincell/index.html

"Source: American Scientist
Date: July-August 2000
Depression and the Birth and Death of Brain Cells

Turnover of neurons in the hippocampus might help explain the onset of and recovery from clinical depression"

PS; there are other types of cells in the brain too; most brain cells are "glial" cells, and there are also blood vessels, lymphatic drainage etc. These are replaced AFAIK.

Answer 5

brain cells are not renewed, sadly. I am not sure about nerve cells, i think they can be renewed but either not often or very slowly and maybe not even alot of them

Answer 6

Nerve cells can be replenished afeter a small or partial injury to that particular neuron. They can be reconnected or reattached during surgery.

Brain cells cannot replenish themselves. Damage to the brain is permanent. That is, unless stem cell research can yield brain cells for replacement.

Answer 7

Neither cells are able to "regrow." However, some nerve cells are able to compensate for other nerve cells that have died. You're not really the same after this happens, but your body tries to compensate for the loss, kinda like re-routing.

Answer 8

No, once you lose brain cells, you can't grow new ones, however there is a sort of process that your body goes through to train them. They won't be the same though and that's why brain damage is so permanent.

Answer 9

Lets say you got drunk every weekend, for 1 year, Your brains cells 10,000 would die off, never to grow back, your grey matter and and cortex would suffer big time, your white blood cells live only 4 days to fight infections, and red blood cell grow everyday to carry oxygen to the brain, skin cell die and renew them selfs depending on your health issues. 1. dry skin vs oily

Answer 10

MY THEORY ON NERVE CELLS' RENEWED ACTIVITY POTENTIAL IN DEAD BONES:

I believe still probably retain their nerve cells, but they are in a dehydrated state. When they get hydrated however, by getting in contact with water seeping underground, they may have the capacity to function at some minimum level, which is of course at a different capacity, versus nerve cells in a living body.

To activate nerve cells, they require minerals, Oxygen, optimum temperature, and electricity. The first two variables are found in water, and of course the fourth one, electricity, is generated by the great cosmic electromagnetic and/or electrostatic force. When these variables are combined, they produce a synergistic action, which may at an optimal temperature, spark life in dead bones.

Electromagnetic fields have generally a profound effect on our nervous system, when we are alive, my understanding is, that they can also have an effect, at a different level, on nerve cells of a dead body lying underground, whether hydrated or dehydrated. The effect is greater however when a body, or even just the bones of a dead body, are in a re-hydrated state, again due to contact with mostly rain water seeping underground.

Electromagnetic and electrostatic fields exist nearly everywhere, and they gain more strength in saturated air, with a relative humidity that is high. As we already know, electricity travels faster in water, because water is highly conductive.

Every dead body has nerve cells, but of a different capacity, and therefore, will be affected accordingly, or perhaps will not be affected at all.

Those who have higher nerve cells capacity may, with the influence of the external strong electromagnetic and electrostatic forces, have the ability to transmit electromagnetic signals or non verbal messages, from the underground and into the atmosphere.

Electromagnetic and electrostatic forces may therefore, have the ability to spark a renewed neural activity in dead bones, given the right conditions as mentioned above. The right conditions can serve as catalysts for electrochemical reactions that may reactivate nerve cells.

Electromagnetic signals may be interpreted in several forms. Some of the familiar ones are:
Non-verbal communication i.e. messages, or, ghosts appearing as visible light faded shapes, that are formed by aura energy fields.

The sun and the moon exert forces and pressure on earth, and its objects. The most influential ones are the gravitational, electrostatic, and the electromagnetic force.

When the moon is in its full phase, it exerts stronger gravitational, electrostatic, and electromagnetic forces on earth, and everything on it and within it.

The combined forces of the moon, and the sun, are especially strong at the full moon phase, because the moon is situated directly between the Earth and Sun.

Furthermore, nerve cells in the bones of a skull, have probably retained historical data of a dead person's past life. If energized and awakened by the factors as discussed above, and therefore have the capacity to release electromagnetic signals, such signals may be either weak or strong.

The signals from a dead person, would probably be received and felt more easily, by the closest relative/s or friend/s of the dead person that's sending the signals. Relatives and friends may be the ones more familiar with the content of such signals.

I therefore deduced that the above forces which are relatively very strong during full moon phase period, may have stronger reviving effect on dead bones' nerve cells. These forces generate stronger energy fields affecting not only the living, but the dead as well.

CONCLUSION:
Strong electromagnetic and electrostatic forces might enable re-hydrated nerve cells in dead bones, to transmit electromagnetic signals that travel through the underground to the atmosphere.
These signals may contain information such as feelings of pain, joy, anger, or even revenge.

However, I must point out lunar and solar forces do not have sufficient power to bring the dead back to life, to form a fully functioning human body.

Again, these signals could be received, felt, and also interpreted by the living entities, who are maybe more familiar with the content of such signals. Usually, it would be the relatives or friends of the dead person that transmit those signals.

Now, who says dead bones can’t have feelings too?

*Similar to the evolution theory, unfortunately my theory would be very difficult to prove, and I accept that.

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