Finally I find the original! So many movies, comics and present day medical nanoscience is based on this story of internal surgery by miniaturization. A cold war scientist has to be saved by brain surgery and a team of doctors and military personnel are sent into his body to do the job in a limited time. Fabulous introduction to the human body - should be shown in science classes everywhere.:)
Racquel Welch not being exploited by her miserable husband was a plus - she's acting, and very well, in this one.