TRANSVERSE SECTIONS OF A TEN MM. PIG EMBRYO 



Spinal ganglion 



R descending aorta 



Pharynx. 



N. vagus 



Ttacheal groove 



R. atrium 



Aorta 



Pulmonary artery 



Spinal cord 



L. descending aorta 

 Int. jugular vein 



Pharyngeal pouch 4 

 L. atrium 

 iPericardial cavity 



L. ventricle 



R. ventricle 



FIG. 132. Transverse section through the fourth pharyngeal pouches of a 10 mm. pig embryo. 



X 22.5. 



Spinal ganglion 



Notochord 



R. descending aorta 

 Esophagus 



r-T Spinal cord 



L. descending aorta 

 Ant. cardinal vein 

 N. vagus 



I., alrium 

 Pulmonary artery 



L. ventricle 



Cavity of bulbus 



R. ventricle 



FIG. 133. Transverse section through the sixth pair of aortic arches and bulbus cordis of a 



10 mm. pig embryo. X 22.5. 



