iSpmal ganglion. 



Notochorcl 



Ext. branch 

 n. accessor/us 



Epiglottis 

 Branch arch 3 



Branch archZ 



Mandibk 



Spinal cord 



Intjugular 

 vein 



N. hypoglosstts 



Gang, nodos. 

 n.10 



Pharyngeal 

 pouch 3 



Aortic arch 3 



Thyreoid anlage. 



Olfactorypit 



FIG. 126. Transverse section through the third pharyngeal pouches of a 10 mm. pig embryo. X 22.5. 



Spinal, qanj. 



R.elesc.aorfa. 



Pharynx 

 N.vagus 



Trachea! groove 

 ft. atrium 



Aorta 

 FblmonaryarTery 



Spinal cord 



L.desc aorta* 



Intjjugular 

 vein 



'Pharyngeal 

 pouch 4 



Latrium 



Pericardia! 

 cavity 



Lventricle 





R.venTi-icie 



FIG. 127. Transverse section through the fourth pharyngeal pouches of a 10 mm. pig embryo. X 22.5. 



136 



