High magnification light micrograph of a child's parathyroid gland. In the first years of life, the gland has a compact appearance, with a parenchyma formed exclusively by chief cells that are arranged to form cords among which are narrow connective tissue spaces occupied almost exclusively by blood capillaries. Oxyphilic cells are not observed and there are no adipocytes in the connective tissue spaces. At this magnification, the polygonal shape of epithelial chief cells can be clearly distinguished.