Ellen McHenry has some good ones for HS/MS students. We've done The Brain, and I own Mapping the Body, but we haven't done it yet. The Brain was a lot of fun!
All of her curricula is flexible, content-rich and super creative with games and activities. (It's just very specific in content area and not geared toward a 36 week school year.) We've done Botany and are using The Elements currently.
Most of the HS level Anatomy and Physiology curricula that I looked at last year required an anatomy coloring book, so if you already have one, I would think a text with pictures isn't necessary. PAC that Aerynne mentioned is super well-organized for teaching, although a little light on information, but also super cheap if you buy the download. It
might actually be a good starting point.
Have you looked at just a copy of Gray's Anatomy? We have
this edition from my dh's college days.