The breast doesn't have muscles. Breast tissue is located on top of the muscles on the chest wall. Blood vessels and lymphatic vessels (a program of vessels that drains fluid) are located all through the breast. Your eyesight of on your own is one you should see become a reality, https://grok.com/share/c2hhcmQtMw%3D%3D_21b4ddf4-c274-418a-a078-c9d2af4898ff