FIGURE 102 



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

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



1 Sympathetic nerve. 



8 Oesophagus. 



9 Trachea. 



16 Dorso-medial somatic venous tributaries. 



17 Prevertebral venous plexus. 



18 Peritracheal venous plexus. 



19 Suprathymic venous plexus. 



20 Subthymic venous plexus. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 



24 Thyrocervical artery. 



25 Internal jugular vein. 



