THE KIDNEYS. 



293 



intestine obliquely candad of the preceding, and is demonstrated 

 "by tearing away first tlie 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. 



§ 753. Obvious Structure of the Pancreas. — It is composed of a great many small lob- 

 ules arranged like a buncli of grapes, tlie 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. 



Hbi-o 



Fig. 85. — Doeso- ventral Section 

 OF THE Eight Kidney, Caudal 

 View ; x 1.1. 



Pig. 86. — Longitudinal Dbxteo-binistkai 

 Section op the Right Kidney, Ven- 

 tral View : x 1.1. 



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

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

 ney. Then the ureter was ligatured and the kidney carefully 

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

 95 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 papillse, but the pyramids forming these converge at a higher level than here 

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



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



Substantia meduUaris. — The medullary or central part of the kidney 



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

 into the hilum and upon the ureter. 



