What is the name of the space in between the lungs where the heart is found?

this is the thoracic cavity, the space between the neck and the abdomen, this contains the lungs, heart & the main artery called the aorta, the lungs are covered by a membrane called the pleura which holds the lungs in situ and is the area affected by pleurisy, if air or gasses are allowed to permeate this area outside the lungs the vacuum that enables breathing is compromised and a collapsed lung can occur.