Lymph, lymphocytes, and lymphatics.

This is a summary of recent developments regarding the role of the lymphatic system in immune responses. Emphasis is on physiological considerations from experiments in sheep. Cell- and tissue-specific lymphocyte traffic patterns measured over several days are considered. Particular attention is given to recent data on the relationship between the central nervous system and the lymphatic system, to cell labeling in situ, and to the entry of immune cells into afferent lymph from the interstitial tissues.