2O6 



HISTOLOGY 



nodules in the cortex are imperfectly separated from one another, and that 

 they are continuous below with the anastomosing medullary cords. 



The lymph glands of the adult (lymp ho glandules, also called Jymph nodes) 

 are round or reniform structures varying in length from a few millimeters 



Afferent lymphatic vessels. 



Lymphoid tissue 



/ Blood vessels. / \f 



Lymphatic vessel. Lymphatic vessel. 



FIG. 194. 



Afferent lymphatic vessels. 



Lymph sinus. 



Capsule. 



Peripheral 

 lymph sinus. 



Capsule. 



Lymph sinus. 



Secondary 

 nodule. 



Medullary 

 cord. 



Trabecula. 



Efferent lymphatic vessels. 

 FIG. 195- DIAGRAMS REPRESENTING FOUR STAGES IN THE DEVELOPMENT OF LYMPH GLANDS. 



to a few centimeters. The largest of them show trabeculae and are sub- 

 divided into cortex and medulla as above described; the small ones remain 

 permanently in the various developmental stages shown in Figs. 194 and 

 195. The smallest structures consist of but a single nodule, with or with- 

 out a germinal center; it contains a simple capillary network in its interior, 



