FIGURES 32, 33 AND 34 



32 Same, section 41. 



33 Same, section 42. 



34 Transverse section tlirouffh left side of lower cervical region in a 14 mm. oat 

 embryo fsorios 212, slide IX. section 24). X 200. 



1 Sympathetic nerve. 



8 Oesophagus. 



11 JuKul.ir lymph sac. 



12 .Insular lymph sac, thoracic duct approach. 



16 Dorso-medial somatic venous tributaries. 



17 Prevertebral venous ])lexus. 



18 Peritracheal venous plexus. 

 22 Vagus. 



24 Thyrocervical artery. 



25 Internal jugular vein. 



