136 MICROSCOPIC -i.v.i TOMY OF THE ORGANS. 



consist only of an endothelial layer. The lymph sinuses pass 

 from the cortex to the medulla, join together, and leave the 

 gland at the hilw by the efferent vessel. At this place the cap- 

 sule is thick and compact, and is known as the hilus stroma. 

 The sinus terminalis is formed at the hilus by the junction of 

 the other lymph sinuses. 



The blood-vessels of the lymph gland were described in detail 

 by Calvert, and worked out in relation to the follicle of the 

 gland. The following account is based on his description : The 



FIG. 96. 



'mgpJga. -;W> 



b* * 't^J* *' ?&'*'' '$&'' * a * #8S***' c 

 .*^** *fci * * %e* ffi. ** ^ 



t^* ^S. I^R ** * ^/"^ ' ^ i ^\ .^?(S^ : " - A ^- fr ^^..-^fl 



Trabeculu irith Medullori/ Lymph sinus 



blood-vessel cord* 



From the medullary substance of a cat's lymph gland, x 250. 



gland is supplied with arteries mainly from the hilus, but also 

 to some extent from the capsule. The arteries at the hilus 

 leave the stroma-substance and enter the trabeculaB, in which 

 they run for a short distance. After leaving the trabeculas 

 they enter the medullary substance and break up into smaller 

 arteries, sometimes sending a small branch to anastomose with 

 the arteries of the capsule (Fig. 97, E). Other arteries at the 

 hilus run directly into the gland substance and enter the medul- 



