TRANSVERSE SECTIONS 



Transverse Section through the Stomach (Fig. 106). The section passes through 

 the upper limb buds and just caudal to the point at which the descending aortce unite to form 

 the median dorsal aorta. As the liver develops in early stages, it comes into relation with the 

 plica vena cava along the dorsal body wall to the right side of the dorsal mesogastrium. The 



Myotbme 



Descending aorta 

 Esophagus 



Sinus venasus 



Valve of 

 Sinus Venosus 



R. atrium 



Spinal cord 



L. Common 

 Cardinal vein 



Inter ventricular 

 Septum 



R.ventricle 

 Somafopleure 



JnTervenJric' 

 ular foramen 



Ptriccrdial 

 cavity 



FIG. 104. Transverse section through the four chambers of the heart of a 6 mm. pig embryo. X 26.5. 



.Spinal cord 



Spinal ganglion 

 Spinal ner/e 



Descending aorta. 



Pleura-peri- 

 toneal Cav'ry 

 R.Luncj bud 



Rvitelline vein 

 Septum transversum 



Pericardia! 

 cavity 



ftvenfric/e 



FIG. 105. Transverse section through the right lung bud and septum transversum of a 6 mm. pig 



embryo. X 26.5. 



Upper limb bud 



Post, cardinal 

 Vein 



Esophagus 



Dorsal 

 lobe liver 



Lesser sac 



L. vitelline 

 vein 



