IOO 



ELEMENTS OF HISTOLOGY. [Chap. xm. 



(plasma cells) are present in considerable numbers in 

 the trabeculse. 



132. The compartments contain masses of adenoid 

 tissue, without being completely filled with it ; those 

 of the cortex contain oval or spherical masses the 

 lymph follicles of the cortex ; those of the medulla 

 cylindrical or irregularly-shaped masses the medullary 

 cylinders. The former anastomose with one another 

 and with the latter, and the latter amongst them- 

 selves, a condition easily understood from what has 

 been said above of the nature of the compartments 

 containing these lymphatic structures. The follicles 



_ and medullary 



cylinders consist 

 of adenoid tissue 

 of exactly the 

 same character as 

 that described in 

 the previous chap- 

 ter. And this 

 tissue also con- 

 tains the last rami- 

 fications of the 

 blood-vessels, i.e., 

 the last branches 

 of the arteries, a 

 rich network of 

 capillary blood- 

 vessels, and the 

 first or smaller 

 branches of the 

 veins. The 



capillaries and 

 other vessels re- 

 ceive also here 

 an adventitious envelope from the adenoid reticulum. 



133. The cortical follicles and the medullary 



Fig. 61. From a Section through a 

 Lymphatic Gland. 



c, The outer capsule; , cortical lymph sinus; 

 a, adenoid tissue of cortical follicle. Numerous 

 nuclei, indicating lymph corpuscles. (Atlas.) 



