TRANSVERSE SECTIONS OF A TEN MM. PIG EMBRYO 



Spinal cord 



Spinal ganglion 



R. descending aorta 



Pharynx 



N. vagus 



Tracked groove 



R. atrium 



Aorta 



Pulmonary artery 



L. ventricle 



R. ventricle 



FlG j 32. Transverse section through the fourth pharyngeal pouches of a 10 mm. pig embryo. 



X 22.5. 



Spinal ganglion 



R, descending aorta 

 Esophagus 



Spinal cord 



L. descending aorta 

 Ant. cardinal vein 

 , vagus 



L. atrium 

 Pulmonary artery 



L. ventricle 



Cavity of bulbus 



R. ventricl 



FlG- I33 ._ Transverse section through the sixth pair of aortic arches and bulbus cordis of 

 10 mrrt. pig embryo. X 22.5. 



