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 

 bUnd 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 sacs at each end. The ventral groove (Sulcus accessorius) 

 curves somewhat ventrally and backward and joins the chief sulcus 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 lies against the 



Fig. 388. — Stomach of Ox; Right View. 

 Oes., (Esophagus; 1, right longitudinal groove of rumen; 2, posterior groove of rumen; 3, 4, coronary grooves; S, 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 

 ruminal surface (Facies ruminahs) 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 rummo-reticular orifice. 

 The lesser. curvature faces to the right and dorsally, and is connected with the 



1 It is important to notice that the reticulum is separated from the pericardium by an in- 

 terval of about 1 to IH inches (ca. 2 to 4 cm.) only, since foreign bodies which are often swal- 

 lowed by cattle lodge in the reticulum, and not rarely (if sharp) perforate the reticulum and dia- 

 phragm. When the reticulum is full, its visceral surface is opposite to the eighth rib. 



