Colorado Cosmetology Written Practice Exam

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What is the Perionychium?

The skin beneath the nail plate
The edge of the base of the nail
The skin that surrounds and touches the nail
The matrix of the nail

The correct answer is: The skin that surrounds and touches the nail

The perionychium is the skin that surrounds and touches the nail. This includes both the proximal nail fold (PNF), which is the portion of skin at the base of the nail, and the lateral nail folds, which are the sides of the nail. Option A is incorrect because it only describes the skin beneath the nail plate, but does not encompass the entire perionychium. Option B is incorrect because it only refers to the edge of the base of the nail and does not mention the skin component. Option D is incorrect because the matrix of the nail is the area of the nail bed where cells rapidly divide and produce new nail tissue, but it does not include the surrounding skin. Therefore, option C is the most accurate depiction of the perionychium.