There are lots of videos about ASL and medical signing on the web. Here are a few of my personal favorites. The signer in these 4 videos is an amazing model for pure ASL:

Eustachian tubes: 


How the Eye Works:

Nervous system:

This is a basic introductory video. This signer has a lot of videos on the web also. We used some of them in ASL 101.

Health Literacy – how to create materials that match the reading level of your patients