VEIN OF MAXILLARY RESIGN 



(BRANCH OF INTERNAL JUGULARl 



OTIC VESICLE 



PRIMORDIUM 

 SUPERIOR SAGITTAL 

 SINUS 



PRIMORDIUM TRANSVERSE 

 SINUS 



PULMONARY ARTERY 



RIGHT ATRIUM 



VEIN OF 

 MANDIBULAR REGION 



(BRANCH OF EXTERNAL 

 JUGULAR) 



INTERNAL JUGULAR 

 VEIN 



DORSAL 

 SEGMENTAL VEINS 



EXTERNAL 

 JUGULAR VEIN 



RIGHT DUCT 

 OF CUVIER 



SUBCARDINAL 

 VEIN 



POSTER lOR 

 VENA CAVA 



METANEPHRIC 

 DUCT 



UMBILICAL 



ARTERY 



TRANSVERSE ANASTOMOSIS 

 OF SUBCAROINALS 



POSTERIOR CARDINAL 



VEIN (, 



I2MM PIG EMBRYO SHOWING RIGHT HALF 

 OF VENOUS SYSTEM 



Fig. 261 — (Continued) (C) Lateral view of 12 mm. embryo showing venous system. 

 (C is redrawn and modified from Minot: 1903, A Laboratory Text-book of Embryology, 

 Blakiston, Philadelphia.) 



548 



