- a membranous partition between two cavities of the body, esp. that separating the lungs or the two pleural sacs
- the space between the pleural sacs, containing the heart and other chest viscera excluding the lungs
Origin of mediastinumModern Latin ; from Medieval Latin mediastinus, in the middle (form influenced, influence by Classical Latin mediastinus, servant, medical assistant) ; from Classical Latin medius, middle: see mid
The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.
Origin of mediastinumNew Latin mediast&imacron;num, from neuter of Medieval Latin mediast&imacron;nus, medial, middle, from Latin, servant employed on general tasks (Medieval Latin anatomical sense probably influenced by Latin intest&imacron;num, intestine), from medius, middle; see medhyo- in Indo-European roots.