1650 



HUMAN ANATOMY. 



The Mesentery and Topography of the Jejuno-Ileum. — Since consid- 

 eration of the mesentery is indispensable for the study of the disposition of the folds 

 and relations of the small intestine, this structure next claims attention. The serous 

 covering of the gut itself requires no further description than to note that it com- 

 pletely surrounds the bowel, except at the double line of its attachment, where there 

 is left space just large enough for the passage of the vessels and nerves. The attached 

 border of the mesentery (Fig. 1399) extends from the left of the front of the first 



Fig. 1403. 



Right lung 



Diaphragm (cut) 



Hepatic vein 



Behind Spigelian 

 lobe 

 Right 

 suprarenal body. 



Probe in foramen 

 of Winslow 



Right kidney 



Beginning. 



of duodenum 



Left end of, 



transverse colon 



Duodenum 



Jejunum 

 Ascending colon 



Ileum. 



Left lung 



CEsophagus 



Spleen 



U j i".''"j Left suprarenal body 



i-J_i Left kidney 



Left end of colon 

 Duodeno-jejunal 

 flexure 



Jejunum 



Descending 

 colon 



&--Ileuni 



^-Sigmoid flexure 



Formalin subject; liver, stomach, transverse mesocolon, and colon have been removed, leaving other abdominal 

 organs in situ ; attachment of cut peritoneum indicated by white line. 



or second lumbar vertebra, immediately below the end of the duodenum, where the 

 superior mesenteric artery enters it, to the right sacro- iliac joint, a distance of about 

 15 cm. (6 in.). The relations of the upper part of the fold are determined by the 

 shape and position of the duodenum. Probably the usual rourse of the mesenteric 

 attachment is from the front of the aorta downward on the fourth part of the duo- 

 denum, across the vena cava to the right sacro-iliac joint. With a V-shaped duo- 



