DISSECTION OF THE THORAX 



403 



THORACIC CAVITY (CAVUM THORACIS). 



It is well to precede the dissection of this region by the study 

 of a frozen or formalin section l through the thorax, a little below 

 its middle, in order that the general relations of the thoracic 

 viscera to one another may be understood. 2 (Vide Fig. 200.) 



FIG. 200. 



Processus spinosus vertebrae thoracalis V. 



Oesophagus 



V. azygos \ 



Lymphoglandulae bronchioles \ 



Bronchus dexter 



A. pulmonalis (ramus 

 dexter) 



Cavum mediastinale posterius 

 Pleura mediastinalis 

 Pleura costalis 

 Aorta desccndens 



Bronchus sinister 

 ' Pulmo sinister 

 /(lobus inferior) 



Pulmo dexter 



V. cava superior /' 



Auricula cordis dextrd' 



Bulbils aortae 



Cartilago costalis IL , 

 Cavum mediastinale anterius 



\ \ v A. pulmonalis 



\ \ Pleura mediastinalis (pleura peri- 

 * Pericardium cardiaca) 



1 "Sinus costomediastinalis 

 Synchondrosis sternalis proximalis 



Horizontal section of the body between the bodies of the fifth and sixth thoracic vertebrae. (After 

 Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 455, Fig. 773.) 



Pleura. 



The student has to study 



(a) Pulmonary pleura (pleura pulmonalis}. 



(b) Parietal pleura (pleura parietalis). 



Between (a) and (b) is the cavity of the pleura (cavum 

 pleurae). 



1 See foot-note on making sections, p. 474. 



2 The student is strongly advised to study a series of cross-sections through 

 the trunk of a human being; in this work he will find the plates and descrip- 

 tions by Dr. Potter, of St. Louis, of great help; these are published under the 

 title " Topographical Anatomy of the Viscera of the Thorax and Abdomen," in 

 the " University Studies of the University of Missouri, 1904." 



