This hypoxia also causes the parasympathetic nerve fibers to die off.

这种缺氧还会导致副交感神经纤维死亡。

But it's not because fingers have more nerve fibers.

但这并不是因为手指部分汇集更多神经纤维的缘故。

The excitation is passed to a nerve fiber, and then propagates into the brain.

这种兴奋状态被传递给神经纤维，随后传导进大脑。

And finally, the nerve fibers themselves have different structures.

最后，神经纤维本身有不同的结构。

That's where the auditory nerve fibers that encode information about sound connect to the brain stem.

这里是编码声音信息的听觉神经纤维与脑干连接的地方。

The tunica externa also has nerve fibers, lymphatic vessels, and in the biggest vessels, the protein elastin.

外膜也有神经纤维、淋巴管，在最大的血管中也有弹性蛋白。

In both cases, the parasympathetic nerve fibers in the cavernosal spaces release acetylcholine from their nerve endings.

在这两种情况下，副交感神经纤维在海绵体间隙通过神经末梢释放乙酰胆碱。

But the nerve fibers of your parasympathetic system begin both above and below where the sympathetic ones do.

但是副交感神经系统的神经纤维是从交感神经的上方和下方开始的。

In this case, some of them become neuroblasts, and eventually the nerve fibers of the plexuses in the gut.

在这种情况下，其中一些变成了神经母细胞，最终成为肠神经丛的神经纤维。

Papilledema is the swelling of the optic disc, which is the point where the optic nerve fibers leave the retina.

视神经乳头水肿是指视盘的肿胀，视盘是视神经纤维离开视网膜的部位。