6i 



This preparation will illustrate the relations of the blood vessels 

 within the kidney, and should be studied in connection with 129, 

 which it supplements. Understand the regions in which the fol- 

 lowing occur and the courses they pursue : (a) the renal arteries, 

 {6) "interlobular" arteries, {c) afferent arteries, (d) glomeruli, (e) 

 efferent vessel, (/) capillaries, {g-} interlobular veins, (/?) renal 

 veins, and (z) the arteriae and venae rectae. Identify them in the 

 preparation. 



J31. Bowman's capsule. Cat. Demonstration. Injected 

 kidney ; paraffin ; sections yu. Stained with hematoxylin and 



picric alcohol. The injection has caused a transudation of fluid into 

 Bowman's capsule ; this fluid has taken the hematoxylin stain, thus 

 illustrating the relation of the glomerulus to Bowman's capsule and 

 the beginning of the urinary tubule. 



132. Papilla of the kidney, (a) Horse. Transection, 

 paraffin ; sections fi. Stain with hematoxylin and picro- 

 fuchsin. From your study of 129 and 130 identify the tubules and 

 vessels shown in this section and note their grouping in relation to 

 each other. 



133. Same ; {b) Homo. Miiller's fluid ; paraffin ; sections 

 fi. Stain with hematoxylin and eosin. Compare this with 



132. 



URETER. 



134. Ureter. . Transection. Picric alcohol ; col- 

 lodion ; sections /t. Stain with hematoxylin and picrofuchsin. 



In addition to the recognition of the three coats and the struct- 

 ure of each, note well (a) the character of the lining epithelium and 

 compare it with the stratified squamous epithelium (10, 99), and (d) 

 the direction of the muscular fibers in the two (or three) muscular 

 layers, and compare with the condition in the digestive tract, e. g., 

 intestine. Compare the epithelium of the ureter with that of the 

 pelvis of the kidney (129). 



BLADDER. 



135. Bladder, — distended. . ; collo- 

 dion ; sections /<. Stain with hematoxylin and picrofuchsin. 



Note the three. coats, and their structure. Can you recognize 

 three layers in the muscular coat ? What is the course of the fiber 



