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...
The toenail grows 0.01 to 0.05 mm/d; growth is more rapid in younger persons. Replacement of an injured or avulsed nail can take 3 to 6 months. Accordingly, recurrent ingrown toenails often become symp-tomatic 3 to 6 months after an initial avulsion procedure.The toenail is supported by the nail unit (Figure 1): the proximal nail fold, the nail bed, the nail matrix, and the hyponychium.he toenail gives stability to the distal soft tissue of the toe, which frequently becomes elevated following ablation of the nail. As a new nail grows outward, it often impinges against the soft tissue, leading to nail deformity or an ingrown toenail.