The crura of the diaphragm are two muscular extensions that connect the diaphragm to the lumbar vertebrae of the spine. They play a crucial role in stabilizing the diaphragm during breathing, allowing it to contract and expand effectively. Each crus is named according to its side: the right crus and the left crus. These structures are important for maintaining proper respiratory function. The diaphragm itself is the primary muscle involved in inhalation, and the crura help anchor it, ensuring that the diaphragm can move efficiently. This coordination is essential for effective airflow into the lungs.