mammary

mammary

1. embryology

   • The embryological development of the breast begins from the 4th-6th week of gestation through ectodermal tissue along the milk line, which will extend from the armpit to the groin. Embryological development of the breast begins from the 4th-6th week of gestation through ectodermal tissue along the milk line, which will extend from the armpit to the groin.
     • As of the 6th-10th week, this line disappears except for the portion located in the 4th intercostal space, where the mammary gland will develop. If any of the portions do not disappear, you may develop some of the hyperplastic alterations that we will see in the section on Congenital Alterations. The remainder of the 4th space will proliferate to form the primary breast bud, which will grow into the dermis.

2. anatomy

   • The breasts lie on the pectoralis major muscle and generally extend vertically from the level of the second rib to the sixth or seventh. Horizontally, it extends from the edge of the sternum to an imaginary midline. of the armpit. At the level of the most distal anterior end of the thorax, at the level of the third intercostal space, the skin specializes to form the areola and the nipple.

3. histology

   • The mammary gland consists of two fundamental elements: the glandular acini, where the milk-producing cells and ducts are located, a set of tubular and hollow structures, branched in the shape of a tree, whose lights progressively converge into thicker and thicker canaliculi until terminate in one of the twelve to eighteen vertices called lactophores. Lactaphores are ductal dilations as reservoirs located immediately behind the nipple, formed by a non-kerantinized squamous epithelium

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