What are those little white half-moon shaped things under your fingernails?

and what purpose do they serve?What are those little white half-moon shaped things under your fingernails?
Lunula: 1. The crescent-shaped area at the base of a fingernail or toenail. 2. Any small crescent- or moon-shaped area or structure.





The lunula is the crescent-shaped whitish area of the bed of a fingernail or toenail. 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 not actually white but only appears so when seen through the nail.





It is half-moon-shaped, and has unique histologic features. It appears by week 14 of gestation, and has a primary structural role in defining the free edge of the distal nail plate (the part of the nail that actually grows outward).





The lunula is most noticeable on the thumb, and not everyone's lunula 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.[citation needed] Any color differences or unusual lines may indicate some type of disease or insufficiency. However, vertical lines on one's fingernails is normal as one ages.





Lunular anomalies include changes in form, structure or color. Lunular dysmorphologic features (that is, anomalies in form) can be characterized by macrolunula, microlunula or anolunula, and nonconvex lunula. Lunular dyschromias (color anomalies) 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.What are those little white half-moon shaped things under your fingernails?
CJR0169 is correct.





Here is a picture with all the parts named.





http://en.wikipedia.org/wiki/Cuticle

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