1. Thymus Cortex Medulla Slide No:21 Material: human fetus thymus
Method: H.E
Interlobular septa, lobule
The periphery of each lobule stained deeply is called cortex, and the central zone stained lightly is called medulla.
The cortex consists of a dense population of thymocytes and a small numbers of epithelial reticular cells.
the medulla consists of many epithelial reticular cells and lymphocytes in smaller numbers.
Cortex
Medulla

2. Thymocyte
Reticular cell
Thymic corpuscles
The medulla contains the red thymic corpuscles, each consisting of several layers of flattened, concentrically arranged epithelial reticular cells.
They are a characteristic feature of the thymus.

3. Lymph node
Capsule
Cortex
Lymph nodules
Paracortical zone
Medulla
Medullary cords
Medullary sinuses

4. The afferent lymphatic vessels are located in the capsule

5. Efferent lymphatic vessels at the hilum

6. 被膜下窦
小梁周窦

7. subcapsular sinusoid

8. peritrabecular sinusoid

9. specific venules-postcapillary in the paracortical zone

10. specific venules-postcapillary in the paracortical zone

11. Spleen Red pulp Splentic cord Splentic sinusoid White pulp
Lymphatic sheath
central artery
Splenic nodule

12. Spleen
Trabecula
Red pulp
White pulp

13. Trabecular artery
Trabecular vein

15. appendix
Small intestine

16. 脾血窦扫描电镜图（M巨噬细胞 N中性粒细胞）

17. 脾长杆状内皮细胞
脾血窦内巨噬细胞

18. 正在穿越脾血窦内皮间隙的RBC

19. 复习思考题
1．比较淋巴结和脾脏的结构异同点。