作者daze (一期一会)
看板ask-why
标题Re: [请益] 人类的四肢
时间Thu Mar 24 01:23:18 2011
1F：推 daze:Axon断掉有机会自己长回去。但一来Axon长的速度约每月3公分， 03/24 00:39
2F：→ daze:而足部与脊髓距离几公分呢？ 二来要长的距离越长就越不容易， 03/24 00:40
3F：→ daze:通常超过5、6公分就没有太大希望了。 03/24 00:41
4F：推 daze:也不是...有用显微手术的话，能长的距离会比较长，但每月3公 03/24 01:11
5F：→ daze:分这问题还是不太容易突破。 03/24 01:11
画个示意图好了。
神经的axon外面包着髓鞘。
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1.如果axon断掉，髓鞘没断。
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则axon可以沿着髓鞘长回去，每月3公分。
(远端的axon就挂掉了，长回去是从近端长到最远端，而不是接上之前断掉的部份。)
2.如果axon没断，髓鞘断了。
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神经的传导可能会有些问题，过一段时间後髓鞘也会修复。
3.如果axon跟髓鞘都断了。
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能修复的机率就很小，距离越长机会越低。
而且神经有tension，一断掉就向两边弹开，中间gap会变大。
显微手术的目的把3修回接近1的状态。
--
You got to know when to hold 'em, know when to fold 'em, Know when to walk away and know when to run.
You never count your money when you're sittin' at the table. There'll be time enough for countin' when the dealin's done.
'Cause ev'ry hand's a winner and ev'ry hand's a loser, And the best that you can hope for is to die in your sleep."
now Ev'ry gambler knows that the secret to survivin' Is knowin' what to throw away and knowing what to keep.
--
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◆ From: 140.112.212.178
※ 编辑: daze 来自: 140.112.212.178 (03/24 01:47)
6F：推 artpoet:推 03/27 19:17