View source for Breast: Normal Anatomy of the Breast

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[[Image:1-1 NA normal nipple 6.30.14-2.jpg|thumb]]
== Location ==
Breast tissue occasionally forms beyond the confines of the gland itself.  This ectopic tissue can occur anywhere in the milk line, a region that runs from the axilla to the groin.  The misplaced tissue can create an accessory nipple or a mass composed of primitive breast tissue.  The ectopic tissue can show physiological changes and can give rise to mammary lesions such as pseudoangiomatous stromal hyperplasia, fibroadenomas, and carcinomas.
[[Image:1-2 Milk lines.jpg|thumb]]
== Glandular Tissue ==
Mammary glandular tissue consists of arborizing ducts and terminal lobules. The largest ducts, termed lactiferous sinuses, drain onto the skin of the nipple.  They number between 15 and 25, have diameters of a few millimeters, and display folded, stellate configurations when cut in cross section.  The lactiferous sinuses form a compact bundle in the nipple and extend posteriorly to become large ducts.  As the large ducts ramify within the gland, they diminish in caliber and branch to form small ducts, ductules, and extralobular terminal ductules, which together comprise the conducting portion of the mammary glandular tree.  The extralobular terminal ductules drain terminal duct lobular units.  The secretory component of the gland consists of intralobular terminal ductules and their attached acini.
[[Image:1-3 NA normal-lobule-cooper 7.29.14.jpg|thumb]]
== Quiz ==
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[[Category:Breast • Weeks 1 • Normal Anatomy of the Breast]]