The lymphatic vessels of the uterus during the sexual cycles of the mice.

Orthograde delineation and characterization of the lymph vascular system in the uterus of the mouse during the sexual cycle was achieved by absorption of Patent Blue Violet and Japan ink. The lymph vessels in the endometrium are dilated by about 8-10 times and of varying calibre during oestrus. A reticular arrangement is characteristic of the subsequent stages, while the picture during pre-oestrus resembles that of oestrus. The dye is carried away very rapidly through the larger lymph vessels in the mesometrium which have their typical string of pearls appearance.