Colorado Cosmetology Written Practice Exam

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What is the living tissue underneath the free edge of the nail called?

Corrugation
Eggshell nails
Hyponychium
Nail matrix

The correct answer is: Hyponychium

The living tissue underneath the free edge of the nail is known as the hyponychium. This structure consists of a layer of epidermis that protects the nail bed and helps to seal off the area between the nail plate and the skin. Option A, corrugation, is an incorrect term as it refers to a type of nail ridging. Option B, eggshell nails, are nails that are thin and fragile, while option D, the nail matrix, is the area where nail cells are produced but is not located underneath the free edge of the nail. Therefore, option C is the only correct answer as it specifically describes the tissue under the free edge of the nail.