الفهرس 
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Abstract
This study was conducted on thyroid gland samples collected during different seasons of the year (twenty per season) and twentyparathyroid gland samples of adult male goats. Both glands were removed from apparently healthy animals immediately after slaughter.
The specimens for light microscope were fixed in 10% neutral buffered formalin and processed by paraffin technique. Sections of 5μm thickness were obtained. The underwent H&E, Silver impregnation technique, Crossmon’s trichrome stain, Orcein stain, AB (pH 2.5), PAS technique, and Periodic Acid Schiff (PAS)-Alcian blue pH (2.5) combination.
Anatomical structure:
The goat’s thyroid gland is a bilobed organ; consisted right and left lobes without an isthmus, and located along the lateral aspect of the trachea. Right lobe has rounded cranial end and pointed caudal end. Left lobe, elongated in shape, has a less pointed cranial end and pointed caudal end.
Ultimobranchial body remnants appear as a white mass at the end of the cranial one-third of the thyroid lobe, found deeply inside thyroid tissue at a distance 0.5 cm from the cranial end and 0.5 cm from the medial border of thyroid lobe.
Parathyroid glands consist of two pairs; external pair (Right and Left) and internal pair (Right and Left). External parathyroid glands might be surrounded by the remnants of thymic tissue, and are located.