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The lunula

P R Cohen1

  • 1Department of Dermatology, University of Texas-Houston Medical School 77030, USA.

Journal of the American Academy of Dermatology
|June 1, 1996
PubMed
Summary
This summary is machine-generated.

The lunula, the white half-moon visible nail matrix, plays a key structural role. Anomalies in its form or color can signal underlying skin or systemic health issues.

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Area of Science:

  • Dermatology
  • Nail Biology

Background:

  • The lunula is the visible part of the distal nail matrix.
  • It has a distinct half-moon shape and unique histology, developing by week 14 of gestation.
  • The lunula is crucial for the structural integrity of the nail plate's free edge.

Purpose of the Study:

  • To describe the morphology and significance of the lunula.
  • To detail various lunular anomalies, including dysmorphologies and dyschromias.
  • To highlight the lunula's potential as an indicator of systemic or cutaneous disorders.

Main Methods:

  • Descriptive analysis of lunular morphology.
  • Classification of lunular anomalies based on form, structure, and color.
  • Review of clinical and histological features.

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Main Results:

  • Lunular anomalies encompass changes in form (macrolunula, microlunula, anolunula, nonconvex lunula) and color (confluent, spotted, longitudinal bands).
  • These alterations can manifest as dysmorphologic features or dyschromias.
  • The lunula's appearance is integral to nail plate structure.

Conclusions:

  • Alterations in lunular morphology or color are significant diagnostic indicators.
  • The lunula's appearance can reflect underlying cutaneous or systemic diseases.
  • Understanding lunular variations is essential for dermatological assessment.