1. Lymphatic Systems
The Thymus

2. Low mag of the thymus Cortex (C) Medulla (M)

3. High mag of the medulla of the thymus
Dark nuclei = T-cells
Larger nuclei = endothelial reticular cells
Arrow = Hassell’s Corpuscle

4. Lymphatic Systems
Lymph Nodes

5. Diagram of a lymph node

6. Cx = cortex w/ lymphatic nodules (F); M = medulla; C = CT capsule
Low mag of a lymph node
Cx = cortex w/ lymphatic nodules (F); M = medulla; C = CT capsule

7. A lymphatic nodule with germinal center (GC)

8. Non-encapsulated Lymphatic Nodules
Lymphatic Systems
Non-encapsulated Lymphatic Nodules

9. Peyers Patches = lymphatic nodules in the ileum

10. Low mag of a palatine or lingual tonsil

11. Palatine Tonsil w/ SS non-K (arrow)
Pharyngeal Tonsil w/ Resp epith (arrow = nodule)

12. Lymphatic Systems
The Spleen

13. Diagram of the Spleen

14. Low magnification of the Spleen
CT Trabeculae
White pulp (lymphatic nodules)
Thick CT capsule
CT Trabeculae
Red Pulp

15. White pulp
Red Pulp
Lymphatic nodules
CT Trabeculae

16. Circulatory System in the Spleen

17. Red Pulp
White Pulp
White Pulp
Red Pulp

18. High mag of the splenic red pulp

19. SEM of the endothelial cells of the sinusoids