EXTERIOR AND RELATIONS 455 
rumen by the dorsal and ventral coronary grooves (Sulcus coronarius dorsalis, 
ventralis). 
The left longitudinal groove (Sulcus longitudinalis sinister) begins at the anterior transverse 
groove, passes somewhat dorsally and backward and divides into two grooves. The ventral 
one is the chief groove, and passes backward to terminate in the angle of union of the posterior 
blind sacs. The dorsal (accessory) groove curves dorsally and then backward to terminate in 
the dorsal coronary sulcus. On the right surface there are two longitudinal grooves. The dorsal 
one is the chief sulcus (Sulcus longitudinalis dexter). It extends in a curved direction (the con- 
vexity being dorsal), and is continuous with the left longitudinal groove by means of the grooves 
between the dorsal and ventral blind saes at each end. The ventral groove (Sulcus accessorius) 
eurves somewhat ventrally and backward and joins the chief suleus between the posterior blind 
sacs. 
The reticulum is the most anterior and the smallest of the four divisions; it 
is opposite to the ribs from the sixth to the seventh or eighth. It les against the 
Fic. 388.—Sromacu or Ox; Rieut View. 
Oes., @sophagus; 1, right longitudinal groove of rumen; 2, posterior groove of rumen; 3, 4, coronary grooves; 5, 6, 
posterior blind sacs of rumen; 7, pylorus. 
diaphragm and liver in such a position that the median plane divides it into two 
nearly equal portions. It is somewhat piriform, but compressed from before 
backward. The parietal or diaphragmatic surface (Facies diaphragmatica) faces 
forward; it is convex and lies against the diaphragm and liver.! The visceral or 
Tuminal surface (Facies ruminalis) faces backward; it is flattened by the press- 
ure of the other three compartments; it ends dorsally by joining the wall of 
the rumen, the concave line of junction corresponding to a ridge in the interior 
of the stomach which forms the lower margin of the large rumino-reticular orifice. 
The lesser curvature faces to the right and dorsally, and is connected with the 
‘Tt is important to notice that the reticulum is separated from the pericardium by an inter- 
val of only an inch or less (ca. 2 em.), since foreign bodies which are often swallowed by cattle 
lodge in the reticulum, and not rarely (if sharp) perforate the reticulum and diaphragm. When 
the reticulum is full, its visceral surface is opposite to the eighth rib. 
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