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Quantification of regional matrix nail production
D De Berker1, B Mawhinney, L Sviland
1Department of Dermatology, Royal Victoria Infirmary, Newcastle upon Tyne, U.K.
The British Journal of Dermatology
|June 1, 1996
Summary
The proximal nail matrix is the primary nail-producing region. Cell counts peak at the lunula, while nail thickness increases distally, suggesting cell shape changes.
Area of Science:
- Nail biology and dermatology.
Background:
- The nail matrix's regional contribution to nail plate formation is not well-defined.
- Understanding nail matrix function is crucial for predicting surgical outcomes and nail regeneration.
Purpose of the Study:
- To quantify the nail-producing capacity of different nail matrix regions.
- To correlate nail cell numbers with nail plate thickness along the nail bed.
Main Methods:
- Histological analysis of 12 human great toenails.
- Counting nail plate cells in the dorsoventral axis at five longitudinal sites.
- Measuring nail plate thickness at the same sites.
Main Results:
- Mean nail cell numbers peaked at the lunula and did not increase further distally.
- Cell numbers at the midpoint between the germinal matrix and lunula reached 81% of the lunula value.
- Nail thickness increased significantly (P=0.02) between the lunula and the distal nail bed, despite stable cell numbers.
Conclusions:
- The proximal nail matrix, particularly around the lunula, is the principal contributor to nail plate formation.
- Increased distal nail thickness suggests nail plate cells alter shape as they move distally.
- Findings align with clinical observations regarding scarring potential after matrix surgery.