THE TOXSIL 



155 



Intermediate types between the lymphatic nodes and the 

 spleenolymph (Vincent*) on the one hand, and between the 

 spleenolymph gland and the spleen and marrowlymph type on the 

 other hand, are of frequent occurrence. 



Blood supply. The afferent artery, according to Drummond, f 

 enters the hilum with the connective tissue, and through the tra- 

 beculae reaches all parts of the gland. In the lymph oid tissue its 

 branches form a capillary plexus whose vessels open into the blood 

 sinuses. All the sinuses, peripheral and secondary, communicate 

 with each other, and from them the blood is ultimately collected 

 into two or more thin-walled veins. In the center of the gland 

 these vessels unite to form an efferent vein which passes out at 

 the hilum. 



THE TONSIL (the Faucial Tonsil, Palatine Tonsil, Amygdala). 

 The tonsil consists of a mass of lymphoid tissue which projects 

 slightly from either side into the cavity of the fauces, and is cov- 



a 



- 



tf ^.';--.C .' i^> ' v ,. >?- /" : ."f- ' ' " < 



'^*&$JM?!A 



FIG. 151. HORIZONTAL SECTION THROUGH THE FAUCIAL TONSIL OF A CHILD. 



Semi-diagrammatic, a, stratified epithelium ; 6, crypts ; c, lymphoid nodule ; d, mucous 



secreting gland. Hematein and eosin. x about 20. 



ered by a layer of stratified epithelium continuous with that which 

 lines the oral and pharyngeal cavities. The lymphoid follicles 

 which compose the tonsil immediately underlie the epithelial coat, 

 and are embedded in areolar connective tissue. 



The epithelial coat here and there penetrates the substance of 



* J. Anat. and Physiol., 1897. 



f J. Anat. and Physiol., 1900. 



