All are true about mediastinum EXCEPT -
Mediastinum : is middle space left in thoracic cavity in between the lungs. The superior & inferior mediastinum is divided by an imaginary line passing through sternal angle anteriorly & lower border of T4 posteriorly. Inferiorly, mediastinum is subdivided into anterior, middle & posterior mediastinum by the pericardium. CONTENTS OF MEDIASTINUM: Superior mediastinum Middle mediastinum Anterior mediastinum Posterior mediastinum Oesophagus Trachea Aoic arch + branches Upper pa of SVC Phrenic nerves Vagus nerve Major pa of thymus Pericardium Hea Pulmonary trunk Ascending aoa Lower SVC Upper IVC Phrenic nerve Sterno - pericardial ligaments Lymph nodes Lowest pa of thymus Areolar tissue Oesophagus Descending thoracic aoa Vagus nerve Azygous, hemiazygos veins.
Hea passes through superior mediastinum
Hea passes through middle mediastinum
Thymus present in superior mediastinum
Lower border of posterior mediastinum is extended more than anterior mediastinum
Surfaces and Grooves