FIGURES 62 AND 63 



62 Same, section 13. 



63 Transverse section of left lower cervical region in a 13 mm. cat embryo 

 (series 92, slide X, section 27), X 225. 



1 Sympathetic nerve. 



8 Oesophagus. 



11 Jugular lymph sac. 



13 Jugular lymph sac, jugular approach. 



14 Jugular lymph sac, subclavian approach. 

 16 Dorso-medial somatic venous tributaries. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 



24 Thyrocervical artery. 



25 Internal jugular vein. 



26 Common jugular vein. 



29 Jugulo-subclavian trunk. 



30 Sixth spinal nerve. 



31 Primitive ulnar veno-lymphatic. 



