LYMPHOID ORGANS. 



125 



i— J 



man is clouded and narrow. It liquefies very readily after 

 death. 



A connective-tissue envelope, permeated by elastic ele- 

 ments, surrounds the organ. Inwards it 

 forms a frame-work (Fig. 116, b); in 

 the spaces of the latter lie soft cells. 

 The superficial cavities are, as a rule, 

 short ; further inwards they acquire a 

 radial elongation (a). Transverse sec- 

 tions of these spaces, which are con- 

 nected at acute angles, frequently present 

 oblong and bean-shaped formations. In- 

 wards, towards the medullary border, 

 the spaces again become smaller, more 

 rounded, and the frame-work substance 

 delicate and reticular, forming a sort of 

 reticular connective tissue (Joesten). 



The contents consist of coarse, granu- 

 lar, membraneless cells, closely pressed 

 against each other, and containing mole- 

 cules of albumen and fat. The cells 

 measure 0.0135 to 0.0174 mm., with 

 nuclei of 0.0056 to 0.0090 mm. In the 

 boundary zone, towards the medullary 

 substance, our cells lodge abundant brownish pigment mole- 

 cules. A delicate connective tissue fibro-reticulum also per- 

 meates these cavities, which have no membrana propria. 



It is likewise not easy to investigate the soft medullary 

 substance. 



The connective-tissue frame-work having again become 

 somewhat more resistent, and at last fused with the connec- 

 tive tissue surrounding the veins, forms large oval cavities. 

 They are larger than the peripheral ones of the cortical layer, 

 without the radiated disposition of the latter. They turn 

 their broad side, on the contrary, towards the surface of the 

 organ. The medullary cavities are, however, rounder and 

 smaller in man. 



Fig. 116. — Cortex of the hu- 

 man suprarenal gland ; d, 

 gland cylinder ; 6, interstitial 

 connective tissue. 



