EXPLANATION OF FIGURE 79 



79 Transverse section of left lower cervical region in a 15 mm. cat embryo 

 (series 245, slide XI, section 24), X 225. 



1 'Sympathetic nerve. 



8 Oesophagus. 



12 Jugular lymph sac, thoracic duct approach. 



14 Jugular lymph sac, subclavian approach. 



16 Dorso-medial somatic venous tributaries. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery. 



24 Thyrocervical artery. 

 26 Common jugular vein. 



