Basic but accurate anatomical drawings are included in the American Jurisprudence 2nd Desk Book.
The classic anatomy treatise is Gray's Anatomy, which includes awesome pictures. A 1918 edition of Gray's is posted on Bartleby.com (www.bartleby.com/107/). More recent editions are available in medical libraries and most online bookstores.
You can also get a lot of information from medical dictionaries (e.g., Steadman's or Gould). If that's not enough, The Attorney's Textbook of Medicine (a 14-volume set) has lots of information and pictures.