TOO 



ELEMENTS OF HISTOLOGY. [Chap. xiu. 



(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 reticulura. 



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.) 



