Rectus Abdominus Anatomy

Anatomy of the Rectus Abdominus Muscles
The rectus abdominus muscles are what we know as the superficial muscles.  These are the muscles that form into the six pack muscle group, but it is important note that they also provide support to the internal organs and play a role in the breathing process.

Referenced Material
Anatomica’s Body Atlas. (2002). San Diego, CA: Thunder Bay Press (pg. 147)