FIGURES 202 AND 203 



* 



202 Same, section 30. 



203 Same, section 31. 



1 Sympathetic nerve. 



3 Right azygos vein, thoracic portion. 



4 Atrophying embryonal vein, forming kernel in interior of develop- 



ing and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degener- 



ating embryonal vein. 



6 Left azygos vein, thoracic portion. 



7 Aorta. 



8 Oesophagus. 



34 Ventro-medial azygos plexus. 



