90 



ELEMENTARY PHYSIOLOGY 



LESS. 



irregularly in the more central parts or medulla (see 

 Fig. 30). Each alveolus is filled witli a network of con- 

 nective tissue, whose meshes are small and closely set in 

 the central part of the alveolus, wider or more open when 

 in contact with the tral)ecula?. The central small meshed 

 network is known as adenoid tissue, ^ is densely packed 



\ 



Fio. 30. — Diagrammatic REPREsinTATiON of a Lymphatic Gland seen in 

 Section. (After Shari'ey.) 



Cap. capeule ; Tr. trabccula? ; G.S. glandular substance; L.S. lymph 

 sinus. In the alveolus marked 1. all the leucocytes are supposed to have 

 been washed out ; in the rest of the gland they are shown in the 

 glandular substance, but washed out of the lymph-sinuses. A.L. af- 

 ferent lymphatic; E.L. efferent lymph.atic. The arrows show the 

 direction in which the lymph enters and leaves the gland. 



with lymph-corpuscles or leucocytes closely resembling 

 the colourless corpu.scles of blood (jj.IOO), and constitutes 

 what is usually spoken of as the glandxilar substance. 

 The more open-me.shed network which surrounds the 

 glandular substance and separates it from the trabeculse 

 is known as the lymph-sinus or lymph-channel. 

 The meshes of the lymph-sinus, like those of the glandular 

 substance, are crowded with leucocytes, but these are not 



1 Also often called retiform or lymphoid connective tissue 

 Lesson XII.) 



(See 



