Parathyroid gland
Chief, or principal, cells are small, polygonal cells with centrally located nuclei. Like most endocrine glands, the parenchymal cells of the parathyroid are arranged in plates with large numbers of intervening fenestrated capillaries. The secretion of parathyroid hormone by chief cells raises blood calcium levels and is regulated by levels of calcium in the blood. 400x
Principal cells >
Chief or principal cells secrete parathyroid hormone, which raises the blood calcium level, in part, by indirectly stimulating osteoclasts to mobilize calcium. Parathyroid hormone release is suppressed by a high blood calcium level.
Capillaries
Chief or principal cells secrete parathyroid hormone, which raises the blood calcium level, in part, by indirectly stimulating osteoclasts to mobilize calcium. Parathyroid hormone release is suppressed by a high blood calcium level.
Image source >
The image was taken from a slide in the University of New England College of Osteopathic Medicine collection.
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