Medclip.com is a great site to explore teaching and instructional videos for medical students, doctors and nurses. You can browse all their videos which are organised into categories such as Medical examination, Clinical skills & procedures and individual systems. It’s not just for undergaduates as there are videos which are geared more for post-graduate trainees. I notice some less educational ones are hosted too but there are many gems out there.
Here’s a sample video from the site on Ophthalmoscopy