FIGURE 171 



171 Reconstruction of left vascular complex of lower cervical and upper thoracic 



regions in a 15.5 mm. cat embryo, (series 143, slides VIII, IX, X, and XI), X 225 

 View from behind and from right side. 



1 Sympathetic nerve. 



3' Right azygos arch. 



3 Right precava. 



6 Left precava. 



6' Left azygos vein, thoracic portion. 



7 Aorta. 



12 Jugular lymph sac, thoracic duct approach. 



13 Jugular lymph sac, jugular approach. 

 17 Prevertebral venous plexus. 



19 Suprathymic venous plexus. 



20 Subthym.ic venous plexus. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 

 23' Right carotid artery. 



24 Thyrocervical artery. 



29 Jugulo-subclavian trunk. 



35 Thoracic duct, preazygos segment. 



36 Thoracic duct, azygos segment. 



40 Innominate vein. 



41 Vertebral artery. 



42 Vertebral vein. 



45 Innominate artery. 



54 Fifth spinal nerve. 



55 Sixth, seventh and eighth spinal nerve 

 57 Right subclavian artery. 



