The abdominal cavity is the largest body cavity in humans and many animals, and holds the bulk of the viscera. It is located below (inferior to) the thoracic cavity, and above the pelvic cavity. Its dome-shaped roof is the thoracic diaphragm (a thin sheet of muscle under the lungs), and its oblique floor is the pelvic inlet (the superior opening of the pelvis). It is a part of the abdominopelvic cavity. It is well connected with the pleural (thoracic) cavity.
