Diagrams allow you to build questions around images, asking learners to identify regions.
Cerego's create suite allows you to select from prefab shapes, or draw your own to highlight the desired area in each image. Then, you can layer in graduated difficulty to make the questions more challenging each time. For example, the first time learners see the diagram, they may be asked to identify a region, while in subsequent reviews they may be asked to click in the appropriate area(s) of the image.
Desirable difficulty in action: