ABDOMINAL VISCERA IN MAN. 193 



(C) The Relation of the Peritoneum to the Ca^cM??i.— Treves 

 (15) states that in his cases he did not find a meso-ca^cum. 

 Defining the caecum as that part of the large intestine below 

 the ileo-ca3cal (or colic) junction, it was not in all cases entirely 

 covered by the peritoneum. In case 11 it was bound to the 

 iliac fossa with the exception of a small part near the root of 

 the appendix. (See the Plate of the large intestine in the next 

 Part.) 



In case 14 the line of reflection of peritoneum to the back of 

 the csecum was considerably below the ileo-caecal junction. In 

 cases 3, 13, 33, and 39, bands of various sorts ran up to the 

 back of the caecum. None of these, perhaps, represent a true 

 meso-c^ecum, but they bound down this part of the bowel more 

 or less. 



The line of reflection of the peritoneum to the l)ack of the 

 ascending colon, or in some cases of the csecum, commenced 

 below, on the average, over the right psoas muscle 2-1 cm. above 

 the level of the anterior superior iliac spine. It passed upwards 

 and outwards behind the large intestine, terminating externally, 

 in many cases, as a fold passing to the iliac crest near its 

 highest part. 



(D) The Peritoneal Folds and PoiLches in the Neighbotirhood of 

 the Ileo-Colic Junetion (fig. 11).— There are particularly 3 or 

 sometimes 4 folds to be considered, and 3 or sometimes 4 

 pouches. 



I shall adopt a nomenclature combining Lockwood and Kolles- 

 ton's (17) with that of Berry (18), and describe them as— 



(1) Ileo-colic fold and fossa. 



(2) Ileo-csecal fold and fossa. 



(3) The meso-appendix. 



(4) The retro-colic fold and fossa (occasionally two fossse— in- 

 ternal and external). 



Very diverse and perplexing are the names and descriptions 

 given to these fold and fossse by some writers. It seems need- 

 lessly so. 



(1.) The Ileo-Colic Fold (fig. 11, case 19).— Jonnesco (20) 

 considers that this fold is more or less present in all cases. 

 Berry, however, found it completely absent in 12 per cent, of 



