This post is part of an occasional series about health-focused apps for Windows 8.1 and Windows Phone. If you’ve developed a health or wellness app on a Windows platform and you’d like to be considered for this series, leave a link to your app in the comments.

There was a time when knowledge of human anatomy was highly prized -- and highly controversial. Would-be physicians had to go some pretty extreme ends to get even a fleeting glimpse of how the human body worked. Is it any wonder medical knowledge advanced so slowly? 

Thankfully, today students have much easier options for learning the basics of human anatomy -- like Essential Anatomy 3. The best-selling anatomy app is available for Windows 8.1, offering users an engaging 3D tour of the human body. It's optimised for touch and delivers best-in-class graphics and medical accuracy. It can be used as a study aid, a medical reference tool for illustrating issues for patients or even just a fun way to learn more about your own body.

The app contains 3D illustrations of 4,000 highly detailed anatomical structures from 10 systems, including skeletal, muscular, vascular, nervous, digestive, lymphatic, respiratory and more. The app's 3D graphics make it easy to view any anatomic structure in isolation, as well as from any angle.You can even hide, fade and isolate individual or multiple structures.  The experience is easy to navigate, easy to search and easy to share.

Best of all, you can try the app for free in the Windows 8.1 store. Why got give it a try and learn a little more about how the human body works?