Tendons and bursa of index finger
The tendons of the hand wrap very close to the bones of the fingers, and the loss of subcutaneous fat is the primary reason that the fingers of the elderly, moribund, and chronically ill appear so bony, yet don’t seem to lose much of their strength.
My grandma once ripped out a 3″ x 0.5″ splinter lodged more than two inches in the sole of my foot after my mom, dad, and forest fire-fighter uncle failed to anything other than make it scoot to the side. Her hands were absolutely skeletal. Don’t underestimate those bone-hands.
Atlas of Applied (Topographical) Human Anatomy. J. Howell Evans, 1906.