👉 The term "phrenicocostal" refers to a specific anatomical structure in the human body that is associated with the process of respiration. This anatomical structure, also known as the diaphragm, is located at the center of the thoracic cavity and separates the lungs from the abdominal cavity. The diaphragm is responsible for maintaining the respiratory rate by expanding and contracting throughout the respiratory cycle. In more detail, the diaphragm is a dome-shaped muscle that extends from