By Framework, I mean the support system for the breathing apparatus, which includes the bones of the pelvis, the spine, the ribs, and the sternum. These bones do more than "hold up" and protect the organs of breathing (the lungs). By being moved by the muscles of the torso, especially the diaphragm and the intercostal muscles, these bones and cartilages are essential to the process of drawing air into the body.
Start by exploring the spine - knowing its anatomy helps greatly in visualizing what is going on in breath, and is essential before exploring the ribs. The sternum is the breastbone that joins the ribs in the front, and the pelvis is the "bowl of bown" where the abdominal muscles attach. Once you understand how the anatomy of the framework, you can move on to explore the process of breathing, Respiration.
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On to Respiration...
More on Muscles, Bones, Cartilages and Ligaments...
Anatomy of the Skeleton
Explore what real bones look like in scanned images of actual x-rays.
Looking for your ulna? Search this site first. Part of the University of Arkansas for Medical Sciences Department of Anatomy's site, this table lists all the bones, with links to the spine - and has specific definitions of every bone in the body.
of the Shoulder
This site at Newcastle-uppon-Tyne, is a fabulous lesson in using the web to teach anatomy. An in depth lesson on the structure of the bones and muscles of the shoulder girdle that attach the upper limb to the torso.