I2O 



NORMAL HISTOLOGY. 



quently somewhat less closely packed than the tissue at the periphery. 

 The afferent lymph-vessels conveying the lymph to the simple 

 follicles break up at the periphery of the nodule into branches, which 

 distribute the lymph to the adenoid tissue ; corresponding efferent 

 vessels carry off the fluid returned from the lymphoid tissue and 

 unite to form larger lymphatic trunks. 



Compound lymphatic follicles, the lymphatic glands of gross 

 anatomy, are formed by the aggregation and . partial fusion of a 



FIG. 144. 





Section of lymph-gland from child, showing general arrangement of lymphoid tissue and lymph- 

 sinuses: a, capsule from which trabeculae (6, 6) extend ; c, masses of dense adenoid tissue composing 

 the cortical follicles ; d, the same, of the medullary cords ; e, lymph-sinuses. 



number of simple nodules. These structures enjoy a wide distri- 

 bution, and are represented by the numerous chains of deep and 



superficial lymph-glands, of which the 

 FIG. 145. axillary and inguinal glands are familiar 



instances. 



The periphery of these lymph-glands 

 is occupied by a firm capsule composed 

 of fibrous connective tissue, inter- 

 mingled with which, in the largest 

 glands, bundles of involuntary 

 muscle are sometimes present. At 

 the position of entrance and exit of 

 the larger blood-vessels and the efferent 

 lymphatic trunks, usually opposite the 

 most convex surface of the organ, the 

 capsule dips deeply into the interior of 

 the gland and forms the hilum. The space included within the 

 capsule is subdivided into a peripheral zone, the cortex, and a 

 centrally situated part, the medulla, which at the hilum reaches 



Section of lymphatic gland of child, 

 including portion of cortex at periphery : 

 c, capsule ; s, loose tissue of the lymph- 

 sinus ; /, denser lymph-tissue of the 

 cortical follicle. 



