ABDOMEN AND PELVIS 



465 



(dc) 



following segment, forming an 

 colico-lienalis of the embryo). 

 Derivatives. 



acute angle (flexura 



(1) From the descending segment: intestinum tenue. 



(2) From the ascending segment: 



a) Terminal part of the intestinum tenue. 



b) Caecum. 



c) Colon ascendens. 



d) Colon transversum. 



The remainder of the primitive intestinal tube, from the flexura colico- 

 lienalis on, is called the intestinum terminate. What are the derivatives 

 of this? Special attention should be paid to the vascular relation of the 

 different segments. 



FIG. 244. 



Aorta - 



Corpus ventriculi 



Mesoduodenum 



Mesocolon ascendens 



Intestinum caecum I- 



_ Flexura coli sinistra 



Mesocolon transversum 

 Flexura duodenojejunalis 



Mesocolon descendens 

 Mesenterium 



Mesocolon sigmoideum 



The form of the human intestinal canal and mesentery in the middle of the fourth month of foetal 

 life. (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 435, Fig. 728. ) 



Make a drawing showing the viscera in position, and name 

 each viscus visible. Make a preliminary survey of the organs 

 in the abdominal cavity, examining exact position and general 

 characters of the stomach (ventriculus) , small intestine (intes- 

 tinum tenue), large intestine (intestinum crassum), rectum (in- 

 testinum rectum), pancreas (pancreas), liver (hepar), and 

 spleen (lien). 



Note that the peritoneum (tunica serosa) lines the walls of 



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