404 LABORATORY MANUAL OF HUMAN ANATOMY 



(ba) Costal pleura (pleura costalis). 



(bb) Mediastinal pleura (pleura mediastinalis) . 

 (be) Diaphragmatic pleura (pleura diaphragmatica). 



The external surface of the pleura costalis has been exposed 

 already by the dissection. The loose areolar tissue between the 

 pleura costalis and the Mm. intercostales interni and internal 



FIG. 201. 



Saw-cuts in sternum in Cunningham's method of opening the anterior mediastinum. 



surface of the costal arches is a part of the endothoracic fascia 

 (fascia end o thoracic a) . 



The mode of reflection backward of the pleura on each side, 

 from the posterior aspect of the sternum, may now be investi- 



