Medically reviewed by Sanja Jelic, MD Key Takeaways The diaphragm is the main muscle used for breathing. The diaphragm helps ...

Pleural effusion, also called water on the lung, happens when fluid builds up in the space between your lungs and chest cavity. You may have symptoms, such as chest pain, depending on the cause. Thin ...

The oral cavity and oropharynx are spaces defined by both hard and soft tissue structures. The oral cavity has muscle and bony boundaries, but the pharynx is a ...