Parathyroid gland of the horse at low power
![](https://sites.tufts.edu/vetimages/files/2021/07/Parathyroid_gland_of_the_horse_at_low_power-20398.jpg)
Organ: Parathyroid Species: Horse. Comments: Low power micrograph of the parathyroid gland with a small portion of the thyroid also present. The parathyroid glands produce parathyroid hormone, which maintains the normal levels of calcium and phosphorus in the blood.