1. The Endocrine System The Pituitary

3. Low magnification – the entire Pituitary Gland Posterior Pituitary Pars Intermedia Anterior Pituitary Pars TuberalisPituitary Stalk

4. High mag of the Anterior Pituitary – note eosinophilic and basophilic cells

5. Growth HormoneACTH Immunohistochemictry of the Anterior Pituitary

6. TEM of the Anterior Pituitary – note different granule morphology C – corticotrophs (ACTH); G – gonadotrophs (FSH,LH) S – somatotrophs (growth hormone); T Thyrotrophs (TSH) ; F – fenestrated capillary

7. High mag of the Posterior Pituitary – neurons, capillaries, and pituicytes

8. High mag of the Posterior Pituitary – note Herring Bodies (arrow)

9. TEM of the Posterior Pituitary UN -unmyelinated neuron; asterisks – Herring Body

10. The Thyroid & Parathyroids

12. High mag of thyroid follicles – note Parafollicular or C-Cells (arrows)

14. Low Magnification of the Parathyroid Gland

15. Parathyroid Gland – note small dark staining chief cells and larger, eosinophilic oxyphil cells

16. The Adrenal Glands

17. Low magnification of the Adrenal Gland Medulla Cortex

18. Adrenal Cortex Zona Glomerulosa Zona Fasciculata Zona Reticularis

19. Adrenal Cortex Zona Glomerulosa (clumps, cords, and follicle like structures Zona Fasciculata (cords of spongiocytes)

20. Adrenal Gland Zona Fasciculata cords of spongiocytes Zona Reticularis darker staining cells

21. Adrenal Medulla

22. The Islets of Langerhan

23. Low magnification of the Pancreas with Islets of Langerhans (arrows)

24. High mag of an Islet – note Beta cells and more eosinophilic Alpha2 cells Acini Alpha Cells

25. GlucagonInsulin Immunohistochemistry of a pancrearic Islet of Langerhans

26. Pineal Body The Seat of the Soul The Third Eye

27. Pineal Gland N – neuroglia P –pinealocytes S – Brain Sand