The breast does not include muscles. Breast tissue is located on top of the muscles on the chest wall. Blood vessels and lymphatic vessels (a technique of vessels that drains fluid) can be found through the breast. Saline Breast Implants – Saline implants are full of a sterile saline solution, https://grok.com/share/c2hhcmQtMw%3D%3D_21b4ddf4-c274-418a-a078-c9d2af4898ff