Morphological and Histochemical study of parathyroid gland in Squirrel Caucasian (Sciurus anomalus) (Gmelin , 1778)

Document Type : Original Article

Authors

1 Department of Biology, College of Education for Pure Science (Ibn Al-Haitham), University of Baghdad, Iraq.

2 Department of Biology, College of Education for Pure Science / Ibn Al-Haitham, University of Baghdad, Baghdad, Iraq

Abstract

Abstract
This study has proven the presence of two pairs of parathyroid glands in S. anomalus, which is located in contact with the thyroid gland and occupies two sites within its tissue, an apical site as well as embedded within the thyroid tissue. The gland appears as an oval or irregularly shaped lobe which thin connective tissue capsule surrounds and is an extension of the thyroid capsule, and septa extend from it to the internal tissue, dividing it into incomplete lobules. In addition, the capsule consists of collagen fibers, elastic fibers, a few reticular fibers, and nuclei of smooth muscle fibers. Histologically, the parathyroid gland consists of three types of cells: chief cells, which are the most common, oxphill cells, and water clear cells were spread throughout the gland tissue. The chief cells appear polygonal in shape, cytoplasm is light in color while The Oxphill cells, which are polygonal cells that are larger in size than the main cells and their cytoplasm is granular. These two types of cells are arranged in the form of columns or cell cords In this study, While the third type of cells are water clear cells, which is the few cell in comparison to the other types. They appear polygonal in shape and are larger in size than the previous two cells. Their nuclei are oval in shape and the cytoplasm is transparent and does not contain granules . the classic stain, Heamatoxyline and Eosin & Masson trichrome stain were used in the study.

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