Figure 2: Stereomicroscopic images of lymph ducts in which Alcian blue and toluidine blue had been injected. (a) Illustration of the left and the right lymph ducts along the epigastric blood vessels in skin (thick arrows). (b) Right axillary node which became blue due to the Alcian blue that flowed through the lymph duct. (c) Right inguinal node into which Alcian blue had been injected. (d) Mosaic of images of the right lymph duct along the epigastric blood vessel (thick arrows). (e) Magnified image of the rectangular area in (d). The blue threadlike structure was the primo vessel, and it was floating in the lymph duct (double arrows). (f) Left axillary node stained with toluidine blue that flowed from the inguinal node through the lymph duct. (g) Left inguinal node into which toluidine blue had been injected. (h) Combined images of the right lymph duct from the inguinal node to the axillary node in which toluidine blue flowed. (i) Magnified image of the rectangular area in (h). The lymph duct (double arrows) and its surrounding tissue were stained blue, but the PVS was not visible. More details are presented in Figure 4.