The diaphragm is a dome-shaped, muscular sheet that separates the chest cavity from the abdominal cavity. It's a major muscle of respiration, acting to inhale and exhale. The diaphragm is attached to the sternum, ribs, and spine, with three muscular parts: sternal, costal, and lumbar, all inserting into the central tendon. Here's a more detailed breakdown of the diaphragm's anatomy: Muscular Parts: Sternal Part: Attached to the posterior aspect of the xiphoid process. Costal Part: Attached to th