cortices. 1  1a (1) : the outer or superficial part of an organ or bodily structure (such as the kidney, adrenal gland, or cerebellum or a bone); especially : cerebral cortex (2) : the proteinaceous usually pigmented layer of a hair below the cuticleb : the outer part of some organisms (such as paramecia)
If a toenail has completely fallen off, it can take up to 18 months for it to grow back. A toenail can take longer to grow back if the nail bed has permanent damage. In some cases, old nails do not completely fall off, and they act as a protective...
I actually ripped off my big toenail completely several years ago. I had to into surgery to make sure it wouldn't get infected or anything. I think it took 5 months to grow all the way back. Now part of my toenail has a yellowish tint, but its not too bad looking. Hopefully yours won't take as long!