HA22 is a high magnification EM view of a portion of the Golgi Apparatus. Transfer vesicles containing protein and lipids from the ER fuse with the cis region/face. These molecules are modified in the intermediate region, and vesicles containing the processed products are released from the trans face. The size of the Golgi varies with the secretory activity of the cell. To see an animation of Golgi function, go to https://youtu.be/rvfvRgk0MfA . The animation starts at 1:00 and gives you a 3D impression of Golgi structure.