anterior mediastinum(redirected from mediastinum anterius)
the narrow nearly potential space between the pericardium posteriorly and the sternum anteriorly that contains the thymus or its remnants, some lymph nodes, and the vessels and branches of the internal thoracic artery.
Synonym(s): mediastinum anterius [TA]
a caudal portion of the mediastinum in the middle of the thorax, bounded ventrally by the body of the sternum and parts of the fourth through the seventh ribs and dorsally by the parietal pericardium, extending downward as far as the diaphragm. Compare middle mediastinum, posterior mediastinum, superior mediastinum.