ANATOMY IX A NUTSHELL. 



485 



from the oesophagus and then passes behind the lesser sac of the peritoneum 

 into the portal vein. 



."). The portal vein is formed by the splenic vein and the superior mesenteric 



vein behind the neck of the pancreas. It passes behind the first part of the 

 duodenum and then in the lesser omentum to the transverse fissure of the liver. 

 It now divides into right and left branches for the right and left lobes of the 

 liver and also gives ;i branch to the Spigelian lobe. For the further subdivi- 

 sion of the portal vein see page 190. 



The portal vein most always receives the cystic vein, although it may 

 sometimes end in the right branch of the portal vein. 



PLATE CCLIX. 



VERTICAL PLATE 



INFUNDIBULIIM 



CRIBRIFORM PLATE 



Superior View of the Ethmoid. 



The veins of the heart are: 



1. The great cardiac vein (coronary vein) commences at the apex of the 



heart and passes to the base of the ventricles in the anterior interventricular 

 groove. From here it passes to the left in the auriculo-ventricular groove to 

 the back pari of the heart where it opens into the coronary sinus. Its opening 

 has a pair of valves. Its radicles are. (a) those winch drain the right ventricle, 

 (b) those from the left ventricle, (c) those from the left auricle. These radicles 

 have valves. 



2. The posterior cardiac vein (the middle cardiac vein) commence- at the 

 apex of the heart and passes along the posterior interventricular groove to 

 empty into the coronary sinus, where it has a valve. 1 1> radicles are. (a) those 

 from the posterior surface of the left ventricle, (b) those from the posterior 

 surface of the right ventricle. 



3. The left cardiac veins collect the blood from the posterior surface of 

 the left ventricle and open into the coronary sinus. There are three or four 

 of these. 



