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The nail matrix is the active tissue (or germinal matrix) that generates cells. The cells harden as they move outward from the nail root to the nail plate. [3] The nail matrix is also known as the matrix unguis, keratogenous membrane, or onychostroma. [4] It is the part of the nail bed that is beneath the nail and contains nerves, lymph and ...
Beau's lines. Beau's lines are deep grooved lines that run from side to side on the fingernail or the toenail. [1] They may look like indentations or ridges in the nail plate. [2]: 657. This condition of the nail was named by a French physician, Joseph Honoré Simon Beau (1806–1865), who first described it in 1846.
Lichen planus. Trachyonychia is a condition characterized by rough accentuated linear ridges (longitudinal striations) on the nails of the fingers and toes. [3] When the condition occurs on all the twenty nails of the fingers and toes, it is known as twenty-nail dystrophy, most evident in childhood, [4] favoring males. [2][5] Trachyonychia ...
Horizontal ridges, aka Beau’s lines, often happen when your body undergoes significant periods of stress and your nail stops growing, says Dr. Lal. Severe viral infections and illnesses. Kidney ...
“Ridges in the fingernails are vertical or horizontal depressions on the nail plate,” says Angela Kim, D.O., a board-certified dermatologist practicing in Yuba City, California. “Ridges can ...
John Calvin Jureit (July 24, 1918 – September 9, 2005) was a civil engineer and the inventor of the Gang Nail connector plate, used in building construction specifically for the joining of timber truss joints of roof, floor trusses and prefabricated wall panels. This invention has been widely credited for the boom in affordable housing ...
Paronychia is an inflammation of the skin around the nail, which can manifest suddenly, often due to the bacterium Staphylococcus aureus, or gradually, typically caused by the fungus Candida albicans. [2][3][4] The term originates from Greek παρά (para) 'around' and ὄνυξ (onyx) 'nail'. [5][6] Risk factors for paronychia include ...
This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between each truss is known ...