The ligaments run from the clavicle and the clavipectoral fascia, branching out through and around breast tissue to the dermis of the skin overlying the breast. The intact ligament suspends the breast from the clavicle and the underlying deep fascia of the upper chest. This has the effect of supporting the breast in its normal position, and maintaining its normal shape. Without the internal support of this ligament, the breast tissue sags under its own weight, losing its normal shape and contour.
Clinical significance
The suspensory ligaments of Cooper play an important role in the change in appearance of the breast that often accompanies the development of inflammatory carcinoma of the breast in which blockage of the locallymphatic ducts causes swelling of the breast. Because the skin remains tethered by the suspensory ligaments of Cooper, it takes on a dimpled appearance reminiscent of the peel of an orange. Carcinomas can also decrease the length of Cooper's ligaments leading to a dimpling.
Many women believe that sagging is caused by the failure of the Cooper's ligaments to support the breast tissue. In fact, sagging is partly determined by genetic factors, but a scientific study found that the biggest factors affecting sagging are cigarette smoking, a woman's body mass index, her number of pregnancies, the size of her breasts before pregnancy, and her age. Many women incorrectly believe that wearing a brassiere prevents their breasts from sagging later in life and that breasts cannot anatomically support themselves. But bra manufacturers have stated that because breasts are formed of fatty tissue and not muscle, bras only affect the shape of breasts while they are being worn. Pathologically heavy breasts may cause pain in the woman's upper thoracic area, but this may be due to a poorly-fitting bra. Numerous reports state that 80–85% of women are wearing the wrong bra size. In middle-aged women, breast ptosis is caused by a combination of factors. If the woman has had children, postpartum hormonal changes will cause the depleted milk glands to atrophy. Women who experience multiple pregnancies repeatedly stretch the skin envelope during engorgement while lactating. In addition, after the birth of each child, the voluminous milk glands diminish in size, contributing further to sagging. As a woman's breasts grow in size during repeated pregnancies, the Cooper's ligaments that maintain the position of the mammary glands against the chest, are stretched and gradually lose strength. Breast tissue and suspensory ligaments may also be stretched if the woman is overweight or loses and gains weight.
