328 



DISSECTION OF THE ABDOMEN. 



Third part is 

 11 



the head of the pancreas, with the common bile-duct. The ducts 

 of the liver and pancreas open into this part of the duodenum. 



The third portion is nearly horizontal ; it crosses from right to left 

 opposite the third lumbar vertebra, in front of the vena cava and 

 aorta. Its anterior surface is crossed from above downwards by the 

 superior mesenteric vessels, and above it is the pancreas. 



The fourth portion ascends on the surface of the left psoas muscle 



Labera! 



The disc bebweerT 

 che i s . c and 2. n ? 

 Lu in bar Vertebrae 



Inber-bubercular 



FIG. 121. DIAGRAM SHOWING THE DISPOSITION OF THE DEEP ORGANS IN 

 THE REGIONS OF THE ABDOMEN (C.A.). 



1, 2, 3 and 4 denote the four parts of the duodenum. 



Fourth part along the left side of the aorta to the inferior surface of the pancreas, 

 s ' where it becomes free at the duodeno-jejunal flexure. 



The DUODENO-JEJUNAL FLEXURE reaches up to the transpyloric 



plane a little to the left of the middle line. It is firmly held up to 



the inferior surface of the pancreas by a strong band of fibres the 



Suspensory suspensory ligament (Lockwood) which passes upwards behind the 



ent ' pancreas. In the child this band consists largely of unstriped 



muscle fibres, and is readily defined. It passes upwards to the 



left of the cceliac axis, and blends with the diaphragm to the 



right of the oesophageal opening. 



