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 your ingrown nail does not heal or keeps coming back, your doctor may remove part of the nail: 1  Numbing medicine is first injected into the toe. 2  The doctor uses scissors to cut along the edge of the nail where the skin is growing over. 3  It takes 2 to 4 months for the nail to regrow.