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From Nordan Symposia
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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English]. First attested in [[English]] in late 14th century, the [[word]] scar derives from Old French escharre, from Late Latin eschara, which is the latinisation of the Greek ἐσχάρα (''eskhara''), meaning "[[hearth]], fire-place", but in medicine "scab, eschar on a wound caused by burning or otherwise"
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1: a mark left (as in the skin) by the [[healing]] of [[injured]] tissue
*2a : a mark left on a stem or branch by a fallen leaf or harvested fruit
:b : cicatrix
*3: a mark or indentation resulting from damage or wear
*4: a lasting [[moral]] or [[emotional]] [[injury]] <one of his men had been killed … in a [[manner]] that left a scar upon his [[mind]] — H. G. Wells>
==Description==
'''Scars''' are areas of fibrous tissue ([http://en.wikipedia.org/wiki/Fibrosis fibrosis]) that replace normal skin after [[injury]]. A scar results from the [[biological]] [[process]] of wound repair in the skin and other tissues of the [[body]]. Thus, scarring is a [[natural]] part of the [[healing]] process. With the exception of very minor lesions, every wound (e.g. after [[accident]], [[disease]], or surgery) results in some degree of scarring. An exception to this is [[animals]] with regeneration, which do not form scars and the tissue will grow back exactly as before.
Scar tissue is the same protein (collagen) as the tissue that it replaces, but the fiber [[composition]] of the protein is different; instead of a [[random]] basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single [[direction]]. This collagen scar tissue alignment is usually of inferior [[functional]] [[quality]] to the normal collagen randomised alignment. For example, scars in the skin are less resistant to ultraviolet [[radiation]], and sweat glands and hair follicles do not grow back within scar tissue. A [http://en.wikipedia.org/wiki/Myocardial_infarction myocardial infarction], commonly known as a heart attack, causes scar formation in the heart muscle, which leads to loss of muscular power and possibly [http://en.wikipedia.org/wiki/Heart_failure heart failure]. However, there are some tissues (e.g. bone) that can heal without any structural or functional deterioration.[http://en.wikipedia.org/wiki/Scar]
[[Category: Biology]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English]. First attested in [[English]] in late 14th century, the [[word]] scar derives from Old French escharre, from Late Latin eschara, which is the latinisation of the Greek ἐσχάρα (''eskhara''), meaning "[[hearth]], fire-place", but in medicine "scab, eschar on a wound caused by burning or otherwise"
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1: a mark left (as in the skin) by the [[healing]] of [[injured]] tissue
*2a : a mark left on a stem or branch by a fallen leaf or harvested fruit
:b : cicatrix
*3: a mark or indentation resulting from damage or wear
*4: a lasting [[moral]] or [[emotional]] [[injury]] <one of his men had been killed … in a [[manner]] that left a scar upon his [[mind]] — H. G. Wells>
==Description==
'''Scars''' are areas of fibrous tissue ([http://en.wikipedia.org/wiki/Fibrosis fibrosis]) that replace normal skin after [[injury]]. A scar results from the [[biological]] [[process]] of wound repair in the skin and other tissues of the [[body]]. Thus, scarring is a [[natural]] part of the [[healing]] process. With the exception of very minor lesions, every wound (e.g. after [[accident]], [[disease]], or surgery) results in some degree of scarring. An exception to this is [[animals]] with regeneration, which do not form scars and the tissue will grow back exactly as before.
Scar tissue is the same protein (collagen) as the tissue that it replaces, but the fiber [[composition]] of the protein is different; instead of a [[random]] basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single [[direction]]. This collagen scar tissue alignment is usually of inferior [[functional]] [[quality]] to the normal collagen randomised alignment. For example, scars in the skin are less resistant to ultraviolet [[radiation]], and sweat glands and hair follicles do not grow back within scar tissue. A [http://en.wikipedia.org/wiki/Myocardial_infarction myocardial infarction], commonly known as a heart attack, causes scar formation in the heart muscle, which leads to loss of muscular power and possibly [http://en.wikipedia.org/wiki/Heart_failure heart failure]. However, there are some tissues (e.g. bone) that can heal without any structural or functional deterioration.[http://en.wikipedia.org/wiki/Scar]
[[Category: Biology]]
