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. rhomooUleus thoracalis 

 m. scrratns ventralis , 



m. subscapularis / / m. terrains dorsalis 



I • I .' m. longissimus dorsi 



m. ilio-costalis 

 Costa 3 



m. longus colli 



(Esophagus 



Trachea 



Vena cava crania/is 



Jluunrus 



Sternum 



Thymus 

 Fig. 9. [Yansverse section of the thorax on a level with the third thoracic vertebra. 



