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Intermammary cleft
In female human anatomy, the intermammary cleft or intermammary sulcus or sulcus intermammarius of a woman is delineated by where the fatty portions of each breast sits in relationship to the sternum (or breastbone).〔Dr. Ted Eisenberg and Joyce K. Eisenberg, ‘’ The Scoop on Breasts: A Plastic Surgeon Busts the Myths’’, eBooks2go, 2012, ISBN 978-0-9857249-3-1〕 It divides the two mammary complexes that consist of two bodies of fatty pads, glandular tissues of mammary glands, connective tissues, and skin, as well as two duct systems (lactiferous duct of lymphatic vessel) and lobule alveoli emanating from two nipples.〔Heide Schatten and Gheorghe M. Constantinescu, ''Comparative Reproductive Biology'', page 17, John Wiley & Sons, 2008, ISBN 978-0-470-39025-2〕〔Genaro Andres Contreras, ''The Use of Tylosin to Treat Intramammary Infections '', page 22, ProQuest, 2008, ISBN 978-0-549-60762-5〕 Lymph vessels can ventrally extend as far as the intermammary sulcus.〔Charles Wesley Turner, ''The mammary gland'' (vol. 1), page 80, Lucas Bros., 1952〕
== Anatomy ==
The International Federation of Associations of Anatomists (IFAA) uses the terms "intermammary sulcus" or "intermammary cleft" when referring to the area between the breasts not including the breasts. In popular usage the area is commonly referred to as a woman's cleavage, especially when exposed by garments with low necklines.
For legal purposes it was noted by the United States federal courts that "anal cleft or cleavage" and "cleavage of the female breast" are so imprecise as to provide no guidance in defining them.〔West's federal supplement (First Series), p. 994, West Publishing Co, 1990〕 Medically, the "width" of a woman's cleavage is determined by the attachment points of her breast tissue to the periosteal tissue covering her sternum and is also defined somewhat by the medial attachments of the pectoralis major muscle when implants are in the sub-muscular position.
Plastic surgeon Alan Matarasso said, "Ergonomically speaking, cleavage equals the position of the breasts on the chest wall."〔Daphne Merkin, "(The Great Divide )", ''New York Times'', August 28, 2005〕 The skin of the cleavage area is frailer than the skin of the face as it has fewer oil glands, and may show loss of elasticity sooner.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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