Here's a more detailed site. Takes time to load but it's good in explaining what they're made of.
[url="http://handlin.cvm.okstate.edu/histology/MR/HiMRP2.htm"]http://handlin.cvm.okstate.edu/histology/MR/HiMRP2.htm[/url]
As to their extreme sensitivity, they're full of nerves, nature's way of reminding us to protect them although it seems to be a poor design to have such delicate organs hanging outside the body.
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