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Mediastinal part of parietal pleura (mediastinal pleura). Pars mediastinalis. Portion of the parietal pleura lining the mediastinum. B C Costal part ofparietal pleura (costal pleura). Pars costalis. It lines the ribs. B C Diaphragmatic part of parietal pleura (diaphragmatic pleura). Pars diaphragmatica. It covers the diaphragm. B

Pleural recesses. Recessus pleurales. Fissure-shaped spaces formed by the parietal pleura for reception of the lungs during inspiration. Costodiaphragmatic recess. Recessus cos-todiaphragmaticus. Pleural recess between the descending sides of the diaphragm and the lateral wall of the thorax. B Costomediastinal recess. Recessus costome-diastinalis. Anterior pleural space between the costal and mediastinal pleura; it is more extensive on the left than on the right. C Phrenicomediastinal recess. Recessus phrenicomediastinalis. Pleural recess situated dorsally between the diaphragm and the mediastinum.

Pulmonary ligament. Lig. pulmonale. Double fold extending from the right and left sides of the hilum, connecting the visceral and medi-astinal pleura. Between both folds the lung abuts against the mediastinal connective tissue free of pleura. B. See also p. 149 B D Mediastinum. Thoracic area between both pleural sacs. It extends from the anterior surface of the vertebral column to the posterior surface of the sternum and from the upper thoracic aperture to the diaphragm. B Superior mediastinum. Mediastinum su-perius. Portion of the mediastinum above the heart. It contains the arch of the aorta together with its branches, as well as the bra-chiocephalic veins, superior vena cava, trachea, esophagus, vagus nerves, thoracic duct, thymus, etc. B

Inferior mediastinum. Mediastinum inferius. Collective term for the following three divisions.

Anterior mediastinum. Mediastinum an-terius. Area between the pericardium and sternum. C

Middle mediastinum. Mediastinum medium. Area occupied by the heart, pericardium and phrenic nerves with their accompanying vessels. C

Posterior mediastinum. Mediastinum post-erius. Area between the pericardium and the vertebral column. It contains the esophagus, vagus nerves, descending aorta, thoracic duct and the azygos and hemiazygos veins. C

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