Breast Anatomy

We will tell you about the composition of a woman’s breasts: the tissues that compose it, its innervation, vascularization of the breast … and many other details.

The breasts are present in both sexes, but in the male they remain rudimentary. In women they vary in their development according to age. Until puberty they remain underdeveloped , and their maximum development occurs during lactation.
They are located in the anterior part of the thorax over the pectoralis major muscle, their base extends from the second to the sixth rib and from the outer edge of the sternum to the mid-axillary line, and their most superior and outer part reaches the armpit.

Basic anatomy

The breast is made up of three types of tissues : glandular tissue, which produces milk, connective tissue, which connects the lobes, and adipose tissue that occupies the space between the lobes.
Each gland is pink in color and consists of 15 to 20 lobes. Each lobe is made up of lobules linked together by connective tissue, blood vessels, and ducts. In the lobules are the alveoli that are blind cul-de-sac that converge at their only outlet into the intralobular ducts. These ducts, once they come out of the lobula, are called interlobular ducts that converge to form the milk ducts and just before their exit through the nipple they form small dilations that are the lactiferous sinuses.

Breast irrigation

The arterial supply to the breast is produced by the axillary , internal mammary, and intercostal arteries . The veins basically drain into the axillary vein. Most of the lymph drains to the lymph nodes in the armpit, but a minor part does so to the contralateral parasternal and mammary nodes. Innervation is produced by the intercostal nerves.

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