1. Immune system 1.Thymus (No.21) 2. Lymph node (No.6) 3. Spleen (No.22)
4. Tonsil (No.23)

2. Capsule
Interlobular septa
Incomplete lobule
Cortex
medulla
Thymus: HEX40

3. Capsule
Interlobular septa
Incomplete lobule
Cortex
medulla
Thymus: HEX100

4. Thymocyte
Epithelial reticular cell
Thymic corpuscle
Thymus: HEX400

5. Spheroid or kidney shaped organ
Hilum
Cortex
Medulla
Lymph node

6. Capsule
Cortex
Lymphoid nodules
Paracortical zone
Cortical lymph sinuses
subcapsular
peritrabecular
Lymph node: HEX40

7. Small lymphocytes
Germinal center
young lymphocytes
reticular cells
macrophages
Lymphoid nodule

8. Postcapillary venules In the paracortical zone LC within the wall
thick endothelial cell
LC within the wall
opening for LC enter LN

9. Lymph node:HEX400 cortical lymph sinuses (subcapsular)

10. Cortical lymph sinuses: peritrabecular sinuses

11. Afferent lymphatic vessel in the capsule: with valves

12. Efferent lymphatic vessels
Blood vessels
Hilum of lymph node

13. Pacinian corpuscle
Nerve fiber bundle

14. Medullary cords
Medullary sinuses
Medulla of lymph node

15. Spleen

16. Capsule
DCT
Smooth muscle
mesothelium
Spleen

17. Trabeculae
artery
vein
Spleen

18. White pulps
Lymphatic sheath
lymphatic tissue
central artery
Splenic nodule

19. White pulps
Lymphatic sheath
lymphatic tissue
central artery
Splenic nodule

20. Red pulps
splenic cord
Splenic sinusoid

21. Tonsil (腭扁桃体)

22. THE END