FIGURE 2-tl 



241 Transverse section of lower thoracic region of 14 mm. cat embryo 

 (series 127, slide X, section 3) X 225. 



1 Sympathetic nerve. 



2 Intersegmental arteries. 



3 Right azygos vein, thoracic portion. 



6 Left azygos vein, thoracic portion. 



7 Aorta. 



8 Oesophagus. 



34 Ventro-medial azygos ple.xus. 



