title: Further observations on the epicardial lymph circulation.
abstract: In the lymphatic vessels in the heart of the pig are structures that influence and determine the direction of the flow of the lymph. These flow-directing structures include simple invaginations of the vessel walls, single-valvulate valves, and double-valvulate valves. The anatomy, frequency, and placement of these structures vary according to differences in the forces maintaining lymph flow. The histology and fine structure of these valves is similar to those of the mesenterium.
mesh_terms: D000818:Animals; D008196:Lymph / Q000502:physiology*; D008208:Lymphatic System / Q000033:anatomy & histology*; D010496:Pericardium / Q000033:anatomy & histology*; D013552:Swine