3.3. Electron microscopic study
3.3.1. Control and vitamin C treated groups
EM examination of ultra-thin sections of the thyroid glands of rats of the control and vitamin C treated groups showing the same ultrastructure picture of normal thyroid follicular cells. The thyrocytes appeared with rounded euchromatic nuclei and numerous short apical microvilli. Their cytoplasm contained RER, abundant mitochondria, prominent Golgi apparatuses, SER, lysosomes, abundant apical vesicles containing colloid and electron dense granules (Fig. 14).