1. Endocrine System Thyroid gland （甲状腺）(No.35) Adrenal gland （肾上腺）(No.36)
Hypophysis（脑垂体） (No.37)
Jun Zhou
School of Medicine, Zhejiang University

2. Thyroid gland Overview Capsule Parenchyma follicles with pink colloid
isthmus
lobe
Overview
Capsule
Parenchyma
follicles with pink colloid
interfollicle stroma

3. Follicle Interfollicle stroma 1)Follicular cells Simble cuboidal epi
Columnar (stimulated)
Squamous (inactive)
2)Parafollicular cells（滤泡旁细胞）
3)Colloid（胶质）
Interfollicle stroma

4. colloid
Follicular cell: Simple cuboidal epithelium

5. P
Parafollicular cells

6. Parafollicular cells, silver-stained

7. Adrenal gland
Capsule
Cortex
Medulla

8. Cortex zona glomerulosa（球状带） zona fasiculata（束状带）
Zona reticularis
zona glomerulosa（球状带）
zona fasiculata（束状带）
zona reticularis（网状带）

9. capsule
Zona glomerulosa
Zona fasiculata
Zona reticularis

10. Zona glomerulosa Small cells in clusters A few lipid droplets

11. Zona fasciculata Occupies large portion of the cortex
Arranged in cords
A lot of lipid droplets

12. Zona reticularis Smaller, deep red-stained cytoplasm
Forming anatomizing network

13. Medulla Chromaffin cells（嗜铬细胞）: polyhedral, with chromaffin granules
Medullary vein
Medulla
Chromaffin cells（嗜铬细胞）: polyhedral, with chromaffin granules
Medullary vein

14. Chromaffin cells

15. Hypophysis (Pituitary gland)
adenohypophysis
Pars distalis
Pars intermedia
Pars tuberalis
neurohypophysis
Pars nervosa
stalk

16. Hypophysis Infundibular stalk Pars distalis Pars nervosa
Pars intermedia
Hypophysis

18. Pars distalis
Pars nervosa

19. Pars distalis Acidophilic cells Basophilic cells: peripherally located
Chromophobe cells: most numerous

20. Acidophil
Basophil
Chromophobes
Pars Distalis

21. Basophil
Acidophil
Chromophobes
Pars distalis

22. Pars intermedia
Follicles
Basophilic cells

23. Pars nervosa: unmyelinated nerve fiber
Herring body

24. Pars distalis
Pars intermedia
Pars nervosa

25. lipofuscin

26. The end!