A longer nail matrix produces a _____ nail plate.

• A. Thinner
• B. More curved
• C. No change
• D. Thicker

Answer: (D)

A longer nail matrix means more tissue available to produce keratinocytes that form the nail plate. With more cells laid down before hardening, more layers accumulate, resulting in a thicker nail plate. The shape or curve of the nail plate is determined mainly by the matrix’s width and the underlying bone and nail bed, not by simply increasing the matrix length. So, extending the matrix increases thickness, not thinning, no change, or curvature.