The diaphragm is the main muscle of respiration, and it separates the thorax from the abdomen and pelvis. There are a number of bits of it worth talking about (anatomically) as things have to pass through it, and it does more than just allow us to breathe easy. Daily Anatomy App: For a random human anatomy question every day on your phone you can get my Daily Anatomy question app from the Apple App Store: https://itunes.apple.com/gb/app/daily-anatomy/id1001729137 or Google Play Store: https://play.google.com/store/apps/details?id=com.suanatomy.dailyanatomy Music by Jahzzar Album: HiFi City Tales Song: Bodies https://soundcloud.com/jahzzar