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| Describe the embryological origin of the parathyroid glands.
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- The parathyroid glands originate from the endoderm of pharyngeal pouches III and IV. The internal gland from pouch IV, external from pouch III.
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| Describe the location of the parathyroid glands.
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- The parathyroid glands are multiple(around four) small glands approximately 1-2mm in length are located about the cranial trachea.
- The two internal glands are embedded within the Thyroid Glands, and the two external glands are outside the thyroid tissue.
- In the Horse, there are 'nests' of parathyroid tissue along the neck to the thoracic inlet.
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| Describe the blood supply and venous drainage of the Parathyroid Glands.
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- Supply = Cranial Thyroid Artery and Caudal Thyroid Artery
- Venous Drainage = Superior, Middle and Inferior Thyroid Veins (leading to Internal Jugular Vein).
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| What are the two cell types of the parathyroid gland, and what is their function?
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- Chief (Principal) Cells - function = production of Parathyroid Hormone, vital for calcium homeostasis.
- Oxyphil Cells - function unclear.
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| Label the following histological section:
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- A = Thyroid
- B = Cords of Principal Cell
- C = Blood Vessels
- D = Capsule
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