This PPT is just introduction to the endocrine glands and parts of the endocrine organs in microscopic sections in brief

1. Histology Of Endocrine System
Dr. Siraz .M. Ausavi
Professor in Anatomy
Great Eastern Medical School
Srikakulam, Andhra Pradesh

2. Pituitary Gland
• Also known as Hypophysis Cerebri
• Situated in the hypophyseal fossa in middle
cranial fossa
• Histologically it shows two parts-
Adenohypophysis and Neurohypophysis
Adenohypophysis shows presence of
chromophobes & chromophils
Chromophils are of two types- Acidophils &
Basophils.

3. • Neurohypophysis- It shows presence of axons
of neuron , cell bodies of which are situated in
hypothalamus. Interspersed among the nerve
fibre few neuroglial cells called as pituicytes.

5. Suprarenal Gland
• Microscopic Section of supra renal Gland
shows two parts.
• Peripheral part is CORTEX
• Central part is MEDULLA
• CORTEX is made up of three layers
Zona Glomerulosa
Zona Fasciculata
Zona Reticularis

6. • Medulla is made of up of cells derived from
neural crest cells representing postganglionic
sympathetic neurons which are of multipolar
variety of neurons.

8. Thyroid Gland
• Section of Thyroid Gland shows follicles lumen
of which is filled with colloid material.
• The lining cells of follicles are simple cuboidal
type.
• The connective tissue in between the follicles
show few faintly eosinophilic cells C cells.
• The C cells secrete thyrocalcitonin.

11. Pancreas
• Pancreas is having both Endocrine and Exocrine
parts.
• The Endocrine part is made up of Islet of
Langerhans which are aggregated in tail part of
pancreas.
• Islet of Langerhans is an encapsulated structure
bounded by thin capsule of reticular fibres.
• In the islet, following three different types of cells
are mainly found. Alpha, Beta and D cells.

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