FIGURE 102 



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102 Transverse section of lower cervical region in a 14 mm. cat embryo (series 

 210, slide VIII, section 41) , X 225. 



1 Sympathetic nei've. 



8 Oesophagus. 



9 Trachea. 



16 Dorso-mecUal somatic venous tributaries. 



17 Prevertebral venous plexus. 



18 Peritracheal venous plexus. 



19 Suprathymic venous plexus. 



20 Subthymic ^'enous plexus. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 



24 Thyrocervical artery. 



25 Internal jugular vein. 



