Parafollicular cells anong thyroid follicles.

The calcitonin secreting C-cells (parafollicular) cells have pale cytoplasm and are found between the follicules. Note the amount of cytoplasm and the staining property of these cells. At one time they were called “clear cells”. Tangential sections of the follicular epithelium yield clusters of smaller cells with eosinophilic cytoplasm. Original mag. 100x. H&E. Parafollicular cells. Thyroid gland. Endocrine System. Dog.