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...
As long as there is no permanent damage to the nail matrix or nail bed, the nail ought to entirely regrow and appear completely normal. Fingernails grow at rate of .13 inches per month. Toenails grow more slowly, usually close to half the rate of fingernails. Fingernails can regrow entirely in three to six months.