THE PLEURiE 



529 



Trapezius 



lihomhoideus 



ngissimus dorsi 

 llifidus 

 'sal vessels 



Cartilage of scapula 



Longissimus 



costarum 



Lalissimus 



dorsi 



Intercostalis 



exteriius 



Serralus 

 veiitralis 



£1- Phrenico-costal 



sinus 



Cutaneus 



E.xterned 



thoracic vessels 

 Ohliquus abiloin- 

 iitis externus 

 Musculo-phrenic 

 vessels 



Anterior abdominal vessels 



Traiisversus thoracis 



Rectus abdominis 

 Pecloralis profundus 

 {p. humeralis) 



Fig. 471. — Cross-sectiox of Body of Horse. 



The section is cut through the eighth thoracic vertebra and the anterior part of the xiphoid cartilage. It cuts the 

 vertebral end of the eighth rib and a little more than half of the seventh rib. The flexures of the great colon and a small 

 part of the liver, which lay in the concavity of the diaphragm, have been removed. The dotted lines indicate the con- 

 tour of the bases of the lungs and the apex of the heart, which are concealed by the diaphragm. The pleural cavities, 

 indicated by wide black lines, are exaggerated for the sake of clearness. 



1, 1'. Lungs: 2, aorta: 3, oesophagus; 4, 4' stem bronchi: 5, 5', pulmonary arteries: 6, 6', large pulmonary veins; 

 7, posterior vena cava: 8, 8', phrenic nerves: 9, vena azygos; 10, falciform and round ligaments of liver; 11, position 

 of apex of heart; 12 (placed on cut surface of sternal part of diaphragm), xiphoid cartilage. The sympathetic trunks 

 (not marked) are shown on each side of the body of the vertebra. The oesophageal trunivs of the vagi (not marked) are 

 shown in relation to the oesophagus. The thoracic duct is ventral to the vena azygos. 



34 



