Based on my teaching experience the powerpoint presentation is for me my basic tool and in between discussions I use the chalk/white board to elaborate some important points. I usually do illustrations/drawings of the organ or region of interest. The models are also my guardian angel to make it even simpler for students to understand. Other instructional supports are drawn as well when needed like the audio/video and overhead transparencies etc. Thanks for this training, it is a big moral support for me that what I'm really doing is in the right track.