Labels:text | screenshot | black and white | black | document OCR: rous The thyroid gland itself consists of ze. functional units or follicles of varyi Each separated by connective tissue (Fig. .1 cells follicle is spherical and lined by epit base of surrounding a central colloid space. e apex each cell is adjacent to a capillary, ar olloid. consists of microvilli pointing into nchial The parafollicular or C-cells of ultin s are body origin secrete calcitonin. These do not present between the follicles and us touch the follicle lumen.