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===[[Hand and finger diagnoses|Nailtip Anatomy]]===
[[File:Human nail anatomy.jpg|thumb|A. Nail plate; B. lunula; C. root; D. sinus; E. matrix; F. nail bed; G. hyponychium; H. free margin.]]
*The '''perionychium''' includes the nail bed and the paronychium.
*The '''paronychium''' is the lateral nail fold (soft tissue lateral to the nail bed).
*The '''hyponychium''' is the palmar surface skin distal to the nail.
*The '''lunula''' is that white semi-moon shaped proximal portion of the nail.
*The '''sterile matrix''' is deep to the nail, adheres to it and is distal to the lunule.  
*The '''germinal''' portion is proximal to the matrix and is responsible for nail growth.