Hair

Description

Cylindrical filaments that grow from the skin of mammals. Hair is a column of overlapping, fused cells that are composed of the protein Keratin. Hair is composed of three parts: the innermost column is the medula, the surrounding live cells (the cortex) contain pigment, and the outermost dead transparent cells are the cuticular scales. Hair grows from follicles embedded in the skin. The portion of the hair outside of the skin is called the shaft. Fine, closely spaced hair that covers most of an animal's body is called Fur. Dense, soft, curled hair is called Wool. Coarse, stiff hairs are called bristles, spines, or quills. Horsehair and cattle hair have been used for brushes, plaster binders, Haircloth, and upholstery stuffing. Rabbit hair, often called rabbit fur, has been used to make felt hats.

Synonyms and Related Terms

pelage; medula; cortex; cuticular scales; hår (Dan., Nor., Sven.); Haar (Deut., Ned.); pelo (Esp.); pilosité humaine (Fr.); cabelo (Port.);

FTIR

Other Properties

Human hair is strong (one strand can hold 100g)

Additional Images

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  Drawing of various hair types

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  Mongoloid hair

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  Mongoloid hair

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  Hair shaft

Sources Checked for Data in Record

• Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972

• Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982

• Encyclopedia Britannica, http://www.britannica.com Comment: "hair." Encyclopædia Britannica. 2004. Encyclopædia Britannica Premium Service. 17 Nov. 2004 .

• Website address 1 Comment: Olympus Microscopy Resource Center at http://www.olympusmicro.com/galleries/abramowitz/pages/hairshaft1large.html

• Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Hair (Accessed Nov. 2, 2005)

• G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971

• Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

• Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

• The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998