Anatomy of the Breasts

Understanding breast anatomy allows women to perform a breast self-examination (BSE) correctly and to notice any unusual changes. Radiologists at Beaumont also rely on a clear understanding of breast anatomy when interpreting state-of-the-art images for diagnostic and treatment purposes. Beaumont Hospitals were the first in Michigan to provide MRI, ultrasound and mammography at their Women’s Breast Imaging Centers.

Computer Aided Detection (CAD) takes a second look at mammograms and breast MRI scans so that abnormalities can be thoroughly investigated. MRI, ultrasound or mammograms can also be used to guide biopsy needle placement accurately if a suspicious area is found.

To learn more about breast anatomy and imaging, click on the links below.
Diagnostic Procedures for Breast Cancer
How to Perform a Breast Self-Examination
Mammography
Frequently Asked Questions about Mammography
Signs and Symptoms of Breast Cancer

Illustration of the anatomy of the female breast, front view

Each breast has 15 to 20 sections, called lobes, that are arranged like the petals of a daisy.

Each lobe has many smaller lobules, which end in dozens of tiny bulbs that can produce milk.

The lobes, lobules, and bulbs are all linked by thin tubes called ducts.

These ducts lead to the nipple in the center of a dark area of skin called the areola.

Fat fills the spaces between lobules and ducts.

There are no muscles in the breast, but muscles lie under each breast and cover the ribs.

Each breast also contains blood vessels and vessels that carry lymph. The lymph vessels lead to small bean-shaped organs called lymph nodes, clusters of which are found under the arm, above the collarbone, and in the chest, as well as in many other parts of the body.

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