The breast does not have muscles. Breast tissue is found along with the muscles with the chest wall. Blood vessels and lymphatic vessels (a process of vessels that drains fluid) are located all over the breast. Physical modifications towards the breasts tend to be recorded within the stretch marks from https://grok.com/share/c2hhcmQtMw%3D%3D_21b4ddf4-c274-418a-a078-c9d2af4898ff