Scheme of lymph node (human)

Lymph node: A. survey; B. detail subcapsular (or marginal) sinus 1. adipose tissue; 2. capsule; 3. afferent lymph vessel with valves (B); 4. subcapsular (or marginal) sinus; 5. germinal centre of a secondary lymphatic nodule (or follicle); 6. crescent or mantle zone indicated by cap of peripheral dense aggregations of B lymphocytes (memory cells); 7. trabecula; 8. intermediate sinus or trabecular sinus; 9. cortex; 10. medulla (blue); 11. medullary sinus; 12. efferent draining lymphatic channel (hilus side); 13. arteriole entering the hilus through a trabecula; 14. vein leaving via the hilus; 15. capillary within crescent (mantle zone); 16. littoral cells of the subcapsular (or marginal) sinus; 17. reticular cell (localized perpendicularly through sinus forming a meshwork); 18. small lymphocyte; 19. arteriole in trabecula close to the capsule; 20. paracortical areas (also called inner or deep or tertiary cortex); The paratrabecular sinuses (8) arise from the subcapsular sinus (4) and continue into the medulla (10) as branching medullary sinuses (11) surrounded by medullary cords