32 



DISSECTION OF THE DOG 



incisions have just been made through that portion of the parietal pleura 

 which is applied to the ribs and therefore called the costal pleura (pleura 



m. rhomboideus thoracalis 

 m. senaXus ventralis / 



suhscapularis I / 



m. serratus dorsalis 

 ' m. longissimus dorsi 



Scapula , ^1 / / ; 



1 j---r:2Z / 7 r 



. ilio-co stalls 

 Costa 3 



m. supraspmalus 



longus colli 

 (Esophagus 



Vena cava cranialis 



Humerus 



Sternum 



Thymus 

 Fig. 9.— Transverse section of the thorax on a level with the third thoracic vertebra. 



