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...
Most falling off toenail will indeed grow bask after fungal infection or severe injuries. However, this might take a long time. With the toe, an injured nail will grow back in around 6 month to a year period after detached. However, this might be various among people, depending on some factors. The nail grow from the matrix, which lies beneath the nails.