They are all quite fragile but very well protected by your skeleton. The skull is a fantastically strong , hard case for your brain and it can take quite a few knocks without damaging the vital organ inside at all.
We are in comparison very fragile. Some organs are damaged by sound, the ears for example, also the kidney, during the Crimean war, it was noted that people who were too close to a canon blast not only died of horrible burns and blood loss but also their kidneys shattered in the concussive blast.
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