3i8 



A MANUAL OF VETERINARY PHYSIOLOGY 



tube ; it runs towards the apex of the pyramid and joins other 

 collecting tubes ; by so doing it becomes larger, and on reaching 

 the apex, is known as a discharging tube or duct of Bellini. The 

 epithelial cells lining the tubules are not of the same character 



A , Cortex of kidney ; 

 a, subcapsular layer 

 not containing glome- 

 ruli ; a', inner struc- 

 ture of cortex also 

 without glomeruli ; B, 

 boundary layer of me ; 

 dulla ; C, papillary 

 part of the medullary ; 

 i, Bowman's capsule 

 of the glomerulus ; 2, 

 neck of capsule ; 3, 

 proximal convoluted 

 tube ; 4, spiral tube ; 

 5, descending limb of 

 Henle ; 6, loop " of 

 Henle ; 7, thick part 

 of ascending limb ; 

 8, spiral part of as- 

 cending limb ; 9, nar- 

 row ascending limb in 

 the medullary ray ; 

 to, the irregular tu- 

 bule ; 11, distal con- 

 voluted tube ; 12, 

 curved collecting tube ; 

 13, straight collecting 

 tube ; 14, collecting 

 tube of boundary 

 layer ; 15, large col- 

 lecting or discharging 

 tubule of papillary 

 layer. 



Fig. 96. — Diagram of the Course of the Uriniferous Tubules (Klein and 

 * Noble Smith). 



throughout ; broadly, they may be divided into a striated or 

 ' rodded ' cell staining readily, and a clear transparent cell 

 staining with difficulty. The ' rodded ' epithelium is suggestive 

 of secreting cells, and is found in the two convoluted tubules, 



