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The lunula (pl.: lunulae; from Latin 'little moon') is the crescent-shaped whitish area of the bed of a fingernail or toenail. In humans, it appears by week 14 [ 1 ] of gestation , and has a primary structural role in defining the free edge of the distal nail plate (the part of the nail that grows outward).
The lunula can best be seen in the thumb and may not be visible in the little finger. The lunula appears white due to a reflection of light at the point where the nail matrix and nail bed meet. The nail bed is the skin beneath the nail plate. It is the area of the nail on which the nail plate rests.
Lunula, the crescent-moon decoration on an ancient Roman calceus senatorius; Lunula (anatomy), the pale half-moon shape at the base of a fingernail; Lunule (bivalve), a crescent-moon shaped area on the shells of some marine bivalves; Calophasia lunula, a species of moth; Chaetodon lunula, a species of butterflyfish; The openings in the test of ...
The lunula is made of decorated gold and dated to 2200-2000 BC and is one of the earliest gold ornaments from Wales. [1] Other estimates suggest 2400-2000 BC of the Late Neolithic/Early Bronze Age. [2] The lunula is the heaviest lunula from the islands of Britain and Ireland, weighing 185g. [3] Llanllyfni lunula.
Erasmus coined the term lunula to refer to the round brackets or parentheses ( ) recalling the shape of the crescent moon (Latin: luna). [6] Most typewriters only had the left and right parentheses. Square brackets appeared with some teleprinters. Braces (curly brackets) first became part of a character set with the 8-bit code of the IBM 7030 ...
A gold lunula (pl. gold lunulae) was a distinctive type of late Neolithic, Chalcolithic, and—most often—early Bronze Age necklace, collar, or pectoral shaped like a crescent moon. Most are from Prehistoric Ireland . [ 1 ]
Its function is to protect the area between the nail and epidermis from exposure to bacteria. The vascularization pattern is similar to that of perionychium. [2] In hoofed animals, the eponychium is the deciduous hoof capsule in fetuses and newborn foals, and is a part of the permanent hoof in older animals. [3]
The Knudsen number is a dimensionless number defined as =, where = mean free path [L 1], = representative physical length scale [L 1].. The representative length scale considered, , may correspond to various physical traits of a system, but most commonly relates to a gap length over which thermal transport or mass transport occurs through a gas phase.