THE KIDNEYS. 



293 



intestine obliquely caudad of the preceding, and is demonstrated 

 by tearing away first the peritoneum and then the pancreatic sub- 

 stance. The anastomosis of the two pancreatic ducts may be dem- 

 onstrated by injecting the ductus Wirsungianus peripherad with 

 Berlin blue. j[ 



752. Obvious Structure of the Pancreas. It is composed of a great many small lob- 

 ules arranged like a bunch of grapes, the ducts representing the stems of the grapes- 

 Such glands are said to be racemose. 



753. The Microscopic Structure as well as the obvious structure is in all essential 

 particulars like that of the salivary glands ( 788, 789). See Strieker, A, 295 ; Quain, A, 

 II, 396. 



FlG. 85. DORSO-VENTRAL SECTION 

 OF THE BIGHT KIDNEY, CAUDAL 

 VIEW ; x 1.1. 



FIG. 86. LONGITUDINAL DEXTRO-SINISTRAI. 

 SECTION OF THE RIGHT KIDNEY, VEN- 

 TRAL VIEW ; x 1.1. 



Preparation Fig. 85, 86. The ureter and pelvis were inflated 

 >y injecting 95 per cent, alcohol through the ureter toward the kid- 

 ley. Then the ureter was ligatured and the kidney carefully 

 amoved and placed in 60 per cent, alcohol for two days, then in 

 )5 per cent, alcohol for the same time. When well hardened it 

 was sliced off to the level shown in the figures. 



Explanation of Fig. 85, 86. Hilum. The concavity of the mesal border of the kid- 

 ney. It is at this point that the ureter and the blood vessels enter. 



Papilla. The apex of the medullary portion. From its free end the urine exudes. 

 There is but one papilla in the cat. In Fig 86, the medullary portion seems to end by 

 several papillae, but the pyramids forming these converge at a higher level than here 

 shown, and finally end as shown in Fig. 85. 



I Pelvis. The somewhat dilated space into which the papilla opens. 

 Substantia medullaris. The medullary or central part of the kidney 

 Tunica fibrosa (Fig. 85). The thick fibrous sac enclosing the kidney. It is reflected 

 to the hilum and upon the ureter. 



