Ant Mediastenum

Question 1

borders of the anterior mediastenum

Answer 1

Lateral borders: Mediastinal pleura (part of the parietal pleural membrane).
Anterior border: Body of the sternum and the transversus thoracis muscles.
Posterior border: Pericardium.
Roof: Continuous with the superior mediastinum at the level of the sternal angle.
Floor: Diaphragm.

Question 2

what are the contents of the anterior medisteuim

Answer 2

The anterior mediastinum contains no major structures. It accommodates loose connective tissue (including the sternopericardial ligaments, which tether the pericardium to the sternum), fat, some lymphatic vessels, lymph nodes and branches of the internal thoracic vessels.

In infants and children, the thymus extends inferiorly into the anterior mediastinum. However the thymus recedes during puberty and is mostly replaced by adipose tissue in the adult.