The lymphatic system is a network of branching vessels that regulate fluid balance and support the immune system. Its smallest capillaries, comprised of a single endothelial cell layer, must stay ...

The cells that make up the walls of the finest of all lymphatic vessels have a lobate, oak leaf-like shape that makes them particularly resilient to changes in fluid volume. A similar cell shape also ...

In its response to pathogens and vaccines, the immune system relies on dendritic cells, white blood cells that patrol the body's tissues, collect components of pathogens and vaccines and transport ...

This photograph highlights the structure of both the vascular and lymphatic systems. The ear is injected intradermally with blue dye to visualize the lymphatic vessels (lymphangiography). The blood ...

These vessels are surrounded by a well-sealed layer of cells and a thicker membrane of connective tissue. Consequently, migration across these barriers is more difficult for dendritic cells, and entry ...