Breast Anatomy and Physiology

Abstract

Breast development begins in the 5th and 6th weeks of fetal development and continues through puberty. Errors during development can lead to abnormal development or complete failure of breast development. The breast comprises several structures that are both functional and supportive. Some of these structures do not fully develop until pregnancy and lactation and regress or involute after lactation and at menopause. The anatomy of the breast and axilla are important in oncological surgery and must be considered during surgical planning to ensure the proper treatment of breast cancer.