As a vocational trainer, I have often used drawings to explain theory to students. Sometimes it is easier to explain a surgical technique if you can see exactly what is happening to the organ. I have also created special designs for this purpose, which you can buy individually or in form of different products. People love them because they're so authentic. 

Find something you like? Talk to me about it! You are welcome to buy my products on Redbubble or I can make you an offer for your own creation.