Slide show: Female breast anatomy
Fat, ligaments and connective tissue in the breast
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Spaces around the lobules and ducts are filled with fat, ligaments and connective tissue. The amount of fat in your breasts largely determines their size. The actual milk-producing structures are nearly the same in all women. Female breast tissue is sensitive to cyclic changes in hormone levels. Most women's breast tissue changes as they age, with more fat relative to the amount of dense tissue.

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