96 



NORMAL HISTOLOGY. 



CHAPTER XII. 



THE LYMPHATIC SYSTEM. 



The lymphatic system includes lymphatic tissues, vessels, organs. 

 Lymphatic tissue is immediately concerned in the production of 

 lymph corpuscles. The yellowish fluid contained in the lymphatic 

 vessels is the lymph. The structures of this system are derived from 

 the epiderm and mesoderm. 



OUTLINE OF THE LYMPHATIC SYSTEM. 



Lymphatic tissue . . 



Lymphatic vessels. 



Adenoid tissue, or connective tissue reticulum. 

 Lymphoid cells. 



Outer coat. 

 Middle coat. 

 Inner coat. 



( Simple nodules , 



Lymphatic follicles { 



f Capsule. 



[ Adenoid tissue and lym- 

 phoid cells. 



f Capsule and trabeculae. 



f Corticalfollicles. 



Compound lymphatic 

 follicles 



Cortex 



I Germinal center. 



Medulla. 

 Hilum. 

 Sinuses. 

 Reticulum. 



Spleen . 



Capsule 



Splenic 

 pulp. . 



Derivation 



Thymus body <j Capsule. 



Lobes . . . 



Serous coat. 

 Fibrous coat. 

 Trabeculse. 



[ Lobes...] 



Divisions . 



Structure 



Septa. 

 Lobules . . 



Loose adenoid tissue. 



Dense adenoid tissue, or 

 Malpighian corpuscles. 



Connective tissue reticu- 

 lum. 



{Leucocytes. 

 Red corpuscles. 

 Lymphoid cells. 

 Pigment granules. 



Cortex. 



Medulla. 



Hassal's corpuscles. 



