NetFrog-

http://frog.edschool.virginia.edu/Frog1/menu.html

first, i'd like to say.. this website is out of date. what i mean by this is that there are no moving animations, the website is very dull and boring (no colour, all leftsided, all monotone). if i was into dissecting frogs.. i wouldnt even want to do anymore because i would have fallen asleep due to the website. however the website is very informative making dissecting a frog very easy with short simple and understandable sentences. which for someone to follow are very good. also the images are fairly blurry.. but the are elidgeable which are a great use to people because they know where to make an incision.