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...
If you are having an accident which causes the big toe nail to come off instantly, you might want to be cautious about some things to prevent more severe infection. A separated nail from the nail bed will not reattach. Instead, a new nail will grow back within a quite long time. A big toe nail, for instance, requires up to 12 months to regrow completely. This new nail might also be in a different shape from the separated one, as this nail grows after the nail bed is injured.