This is from chinese medicine, not from Hulda's book:
Big toe corresponds to pancreas, spleen and liver. Energy meridians of those organs are "traveling" through big toe.
Outer side of big toe nail corresponds to pancreas & spleen, and the side of toe nail closer to the second toe, corresponds to liver. People who's liver is in a very wek condition, can have that side of a big toe swallen and painfull.
Top of the second and third toe corresponds to stomach - stomach meridian.
Fourth toe corresponds to gallbladder.
Fifth toe (small) corresponds to urinary bladder.
Look for acupuncture charts to see exact points and meridians.