What is the origin of the diaphragm?

[Lyudmilascience]

I dont understand how could it attach at the sternum.that would mean it is above that part of the ribs. I understand how it could attach to the vertebra though. How many attachments does it have? this is the website where I found the information

http://thewellnessdigest.com/diaphragm-muscle-anatomy-origin-insertion-action-and-innervation/