In this low magnification image (HA1), note the difference in appearance between the pars distalis and pars nervosa. In the region between the pars distalis and pars nervosa you will see the colloid filled cysts of the pars intermedia . These colloid filled cysts are common in normal human pituitary. Note: the term colloid in this context is a general term for a homogeneous substance. Thus, the material you will see in the middle of thyroid follicles is also called colloid, even though the proteins are entirely different. The pars tuberalis (T) is not present in its full length.