FIGURE 170 



170 Reconstruction of left vascular complex of lower cervical and upper 

 thoracic regions of a 15 mm. cat embryo (series 218, slide VIII, sections 25 to 

 44; slide IX, sections 1 to 48; slide X, sections 1 to 48; slide XI, sections 1 to 

 48; slide XII, sections 1 to 48, X 225), dorsal view. 



1 Sympathetic nerve. 



3' Right azygos vein. 



3 Right precava. 



6 Left precava. 



6' Left azygos vein, thoracic portion. 



7 Aorta. 



10 Pulmonary artery. 



12 Jugular lymph sac, thoracic duct approach. 



16 Dorso-medial somatic venous tributaries. 



22 Vagus. 



24 Thyrocervical artery. 



33 Left subclavian artery. 



35 Thoracic duct, preazygos segment. 



35' Detached lymphatic space in path of preazygos channel. 



37 Broncho-mediastinal duct. 



41 Vertebral artery. 



42 Vertebral vein. 



45 Innominate artery. 



46 Left superior intercostal vein. 



53 Precaval lymphatics. 



54 Fifth spinal nerve. 



55 Sixth, seventh and eighth spinal nerve 



56 Ductus arteriosus Botalli. 



57 Right subclavian artery. 



