TRANSVERSE SECTIONS OF A TEN MM. PIG EMBRYO 



129 



Spinal ganglion 



Spin il cord 



L descending aorla 

 Jill, jugular vein 



1 /laryngeal pouch 4 

 I atrium 

 Pericardial cavity 



L ventricle 



R. ventricle 

 Fig. 132. — Transverse section through the fourth pharyngealpoiiches of a 10 mm. pig embryo. X 22.5. 



Spinal gangl 



Notocit 



R. descending aorta 

 Esopliagiii 



I cord 



Trachea 



descending aorta 

 nt. cardinal vein 

 . vagus 



L. atrium 

 Pulmonary artery 



L. ventricle 



Cavity of bulbii 



R. ventrielc' 



Fig. 133. — Transverse section through the fifth pair of aortic arches and bulbus cordis of a 10 mm. pig 



embryo. X 22.5. 



9 



