What is the Diaphragm Muscle?
The diaphragm muscle is a sheet of muscle essential for humans and other mammals to breathe. It is a dome-shaped cavity near the lungs, between the thoracic cavity of the upper chest and the abdominal cavity of the stomach. The diaphragm muscle extends across the bottom of the ribcage and is the principle muscle of respiration. It is a convex muscle that contracts and relaxes as breathing takes place, and is often known as the thoracic diaphragm to differentiate it from two other diaphragms in the human body, located near the pelvis.
