The Endocrine System
The Pituitary
Low magnification – the entire Pituitary Gland
Posterior Pituitary Pars Intermedia Anterior Pituitary
Pars TuberalisPituitary Stalk
High mag of the Anterior Pituitary – note eosinophilic and basophilic cells
Growth Hormone ACTH
Immunohistochemictry of the Anterior Pituitary
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
High mag of the Posterior Pituitary – neurons, capillaries, and pituicytes
High mag of the Posterior Pituitary – note Herring Bodies (arrow)
TEM of the Posterior Pituitary UN -unmyelinated neuron; asterisks – Herring Body
The Thyroid & Parathyroids
High mag of thyroid follicles – note Parafollicular or C-Cells (arrows)
Low Magnification of the Parathyroid Gland
Parathyroid Gland – note small dark staining chief cells and larger, eosinophilic oxyphil cells
The Adrenal Glands
Low magnification of the Adrenal Gland
Medulla
Cortex
Cortex
Adrenal Cortex
Zona Glomerulosa
Zona Fasciculata
Zona Reticularis
Adrenal Cortex
Zona Glomerulosa
(clumps, cords, and follicle like structures
Zona Fasciculata
(cords of spongiocytes)
Adrenal Gland
Zona Fasciculata
cords of spongiocytes
Zona Reticularis
darker staining cells
The Islets of Langerhan
Low magnification of the Pancreas with Islets of Langerhans (arrows)
High mag of an Islet – note Beta cells and more eosinophilic Alpha2 cells
Acini
Alpha Cells
Glucagon Insulin
Immunohistochemistry of a pancrearic Islet of Langerhans
Pineal Body
The Seat of the Soul
The Third Eye
Pineal Gland
N – neuroglia
P –pinealocytes
S – Brain Sand