82 KIDNEY. 



Isolated renal tubules of small rabbit, (p. slices in 30 cc HC1 

 for 2 or 3 hours. Dissociate the renal substance into wedges, 

 and separate by agitation in water) (Stohr). (After thorough 

 washing stain 48 hours in 19 and dissociate in glycerin jelly ; 

 m. in the same). Find glomeruli in their Bowman's capsules 

 connected with convoluted tubes, fragments of Henle's loops and 

 of Collecting tubes. The character of the epithelium is not very 

 much altered. 



Embyonic Kidney^ from a mammalian Foetus, preferably 

 human. T.S. (p. 15, s. 17 or 22, c. P., m. B.) (L) The tubules are 

 simple and visible throughout their whole extent; they run 

 nearly straight from the papilla, and have a crook-shaped bend 

 close to the cortical surface, where they present a cup-shaped 

 expansion. There is much intestitial connective tissue. (H) 

 Examine the peripheral expansion of the tube (early stage of 

 Bowman's capsule), recognise its crescentic form, the concavity of 

 which is made up of tall cells, and partially embraces the future 

 glomerulus. At this stage the glomerulus appears as a mass of 

 cells connected with the blood-vessel. The details vary in their 

 form with the state of the development of the individual 

 glomerulus. In the young compound kidney (human), the 

 individual malpighian pyramids or simple kidneys are in contact 

 .along the lateral portions of their cortices (columns of Bertin). 



Ureter, Kitten or Dog. T.S. (p. 3, inj., s. 22 & 24, c, P., 

 m. B.) (L) The mucous coat is covered with stratified epithelium 

 of the transitional variety ; note the flattened superficial cells. 

 Examine the loose connective coat outside, and observe that it is 

 vascular. External to this is the muscular coat, the strongest 

 part of which is transversely disposed, longitudinal fibres 

 occurring on both its inner and outer aspect. Externally to all 

 is a loose fibrous covering. 



