What are the definitions of these words: dissecting pan, dissecting needle, glass slide, and depression slide?

Oh, we had to dissect a frog 2 days ago….ew. DIssecting pan is a metal pan with a corkboard bottom to (ew) pin the animal to. Dissecting needles are llike pushpins, but sharper, to remover major organs. Glass slides are magnifieing glasses to slide over for observation and I have no idea what depression slides are.