FIGURES 194 AND 195 



194 Transverse section of middle thoracic region of 11 mm. rat embryo: 

 (series 213, slide XI, section 9) X 225. 



195 Same, section 10. 



1 Sympathetic nerve. 



3 Right azygos vein, thoracic portion. 



6 Left azygos vein, thoracic portion. 



7 Aorta. 



8 Oesophagus. 



34 Ventro-medial azygos plexus. 



