author(s)
Amer M Hussin

abstract
This study was designed to find a new histological guide for detection of the thyroid hypo activity of camels. The thyroid tissue was prepared by routine histological techniques and examined under light microscope. The striking result revealed that the organization of the thyroid follicles during the hypoactive summer season provides a special pattern. The results revealed that the shape and size of the thyroid cells and follicles were dynamic. The size of thyroid follicles were increased as directed from the periphery toward the center of the thyroid tissue. This picture was different in hyperactive winter season. The union of the smaller thyroid follicles with each other produces larger medium ones, which in turn united to produce larger giant ones. So that the number of follicles decreases as directed from the periphery to the center. In summer season, the thyroid follicles were lined mostly by low follicular epithelial cells, squamous to low cuboidal. Cuboidal follicular cells were rarely noticed, columnar cells were not observed. Moreover, the thyroid follicles were mostly filled with homogenous colloid. The present study concluded that this design provides firstly a novel histological pattern for detection of the hypo activity of the thyroid gland and in turn, suggested the low metabolism of the body.