The breasts of an adult woman are milk-producing, tear-shaped glands.
They are supported by and attached to the front of the chest wall on
either side of the breastbone or sternum by ligaments. They rest on the
major chest muscle, the pectoralis major.
The breast has no muscle tissue. A layer of fat surrounds the glands and extends throughout the breast.
The breast is responsive to a complex interplay of hormones that
cause the tissue to develop, enlarge and produce milk. The three major
hormones affecting the breast are estrogen, progesterone and prolactin,
which cause glandular tissue in the breast and the uterus to change
during the menstrual cycle.
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