Endocrine Glands

Thyroid and parathyroid glands, Human, Monkey

Thyroid follicles of varoius sizes filled with colloid are seen. Do you see blood vessels in the inter-follicular regions? Large groups of cells may be present between some of the follicles. If the nuclei are of the same size and staining characteristics, it could mean the section went through the wall of the follicle in a tangential manner without including the lumen. Portion of parathyroid gland is included in the section. Do not confuse its component cells with the lymphoid aggregations(usually are smaller and stained darker). Identify the chief cells(principal cells) and also oxyphil cells(with acidophilic cytoplasm). Adipocytes are present.

Human

Monkey