The medulla region of the lymph node contains primarily B lymphocytes. The medulla region of the lymph node contains plasma cells and macrophages. The lymphatic system begins with lymphatic capillaries embedded within the connective tissues of organs. Lymphatic capillaries contain a discontinuous basal lamina. Lymphatic capillaries are lined by endothelium.
Lymphatic capillaries are larger than blood capillaries.
The large lymphatic vessels and ducts are lined by smooth muscle. Lymphatic capillaries are not found in the kidney. Diffuse lymphatic tissue consists of WBCs and macrophages enmeshed in reticular fibers. Dense lymphatic tissue associated pseudostratified ciliated epithelium. Encapsulated lymphoid organ with afferent and efferent lymphatics.