The aim of the current study is to determine the histological and histochemical characteristics of the thyroid glands in local male squirrels. So, thyroid gland tissue was freshly collected from an adult healthy local male squirrel for histological preparation and examination. All histological sections were prepared and stained with routine stains H & E, in addition to specific stains including Masson Trichrome and PAS stains. The histological results showed that thyroid glands consisted of glandular parenchyma enclosed by a capsule which mainly consisted of collagen fibers and sent septa into glandular parenchyma to form lobules that contained follicles of thyroid glands. These follicles of glandular were lined by simple cuboidal epithelium and some epithelium displayed a simple squamous epithelium, and were filled with colloid material which was positive with PAS stain. Accordingly, capsule thickness, follicle diameters, and heights of the epithelium of glandular parenchyma did not show any significant differences between the right and left lobes at (p< 0.05). Also, parafollicular cells (C-cells), are detected as single cells interspersed between the follicular cells or as a small group of (1-2) cells between the follicles. These findings showed that the main structures of the thyroid gland are similar to most species of mammalian glands.
Read full abstract