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Encyclopedia > Lunula (anatomy)

The lunula is the crescent shaped whitish area of the nail bed of a fingernail or toenail. This article discusses the anatomical nail. ... A toenail is the nail found on a toe. ...


To be specific it is located at the end of the nail that is closest to the skin of the finger but still lies under the nail.


It is white, half-moon-shaped, appears by week 14 of gestation, has unique histologic features. The lunula has a primary structural role in defining the free edge of the distal nail plate. Lunular anomalies include changes in form and structure and in color. Lunular dysmorphologic features can be characterized by macrolunula, microlunula or anolunula, and nonconvex lunula. Lunular dyschromias can be confluent or spotted or can be characterized by longitudinal colored bands that traverse the lunula. Alterations in the morphologic features or color (or both) of the lunula can be an indication of either a cutaneous or a systemic disorder.


The lunula is most pronounced on the thumb and not everyone's is visible. The lunula and the nail itself are good places to find warning signs of certain diseases such as liver disease, kidney disease, heart problems, and lung diseases.


The shape of the lunula determines the shape of the free edge (or the part of the nail that actually grows outward). Any color differences or unsual lines may indicate some type of disease or insufficiency.


Edit by --Special Forces 22:39, 5 July 2006 (UTC)


  Results from FactBites:
 
Lunula (anatomy) - Wikipedia, the free encyclopedia (142 words)
The lunula is the crescent shaped whitish area of the nail bed of a fingernail or toenail.
The lunula has a primary structural role in defining the free edge of the distal nail plate.
Alterations in the morphologic features or color (or both) of the lunula can be an indication of either a cutaneous or a systemic disorder.
AllRefer.com - nail, in anatomy (Anatomy And Physiology) - Encyclopedia (298 words)
nail, in anatomy, the horny outgrowth shielding the tip of the finger and the toe in humans and most other primates.
The nail consists of dead cells pushed outward by dividing cells in the root, a fold of epidermis at the base of the nail (see skin).
The small-celled and relatively bloodless tissue near the base of the nail forms a white, crescent-shaped spot called the lunula, or moon.
  More results at FactBites »

 
 

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