In their base state they contain specialized membrane structures known as tubulovesicles. They also have pits in their apical membranes which are like microscopic blind alleys which are known as secretory canaliculi.
En estado basal contiene estructuras de membranas especializadas conocidas como túbulo vesículas, e igualmente presenta invaginaciones de la membrana apical a manera de sacos ciegos conocidos como canalículos secretorios.