104 THE ESSENTIALS OF HISTOLOGY 



(perilympliatic nodule) ; or the lymphatic is dilated into a sinus and 



Fio. 128. DEVELOPING I/VMPHATIC NODULES, FROM THE OMENTUM OF A GUINEA- 



PIO. 



A, perilymphatic nodule ; a, lymphatic vessel ; c, part of its epithelial wall, seen in optical 

 section ; e, lymph-corpuscles within the vessel ; 6, lymphoid tissue of the nodule ; d, blood- 

 capillaries ; B, endolymphatic nodnle ; a, vein ; ft, artery ; c, capillaries ; d, a lymphatic 

 vessel, in which this w'.iole system of blood-vessels is enclosed ; e, lymphoid tissue within 

 the lymphatic vessel ; /, wall of the lymphatic in optical section. 



the formation of lymphoid tissiie occurs within it (endolymphatic 

 nodule) (see fig. 128). 



