The breast isn't going to have muscles. Breast tissue is found in addition to the muscles on the upper body wall. Blood vessels and lymphatic vessels (a system of vessels that drains fluid) are located throughout the breast. About two a long time once the onset of puberty (a lady's https://grok.com/share/c2hhcmQtMw%3D%3D_21b4ddf4-c274-418a-a078-c9d2af4898ff