FIGURE 159 



159 Transection of upper thoracic region in a 14 mm. cat embryo (series 212, 

 slide VII, section 23), X 150. 



1 Sympathetic nerve. 



8 Oesophagus. 



9 Trachea. 



11 Jugular lymph sac. 



16 Dorso-medial somatic venous tributaries. 



17 Prevertebral venous plexus. 



20 Subthymic venous plexus. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 

 25 Internal jugular vein. 

 33 Left subclavian artery. 



