BREAST,ILLUSTRATION. BREAST,ILLUSTRATION Venous network of the breast. The breast is served by branches mammary veins issue from the subclavian vein, the axillary vein, the lateral thoracic vein and the internal thoracic vein. The venous network is more superficial than the arterial network. This image is part of a series on the anatomy of the breast. See. Images 0288607 for the glandular tissue, 0289607 for the conjonctive tissue, 0289707 for the adipous tissue alone, 0288907 for the arterial a