Having said that, the breast tissue is found on top of the muscles in the upper body wall. The characteristic bounce of the breast arises from the elasticity with the matrix of connective tissue fibers within the breast. Your mammogram report may note that you have dense breasts. Dense breasts https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb