324 



THE LARYNX, LUNGS, VOCAL SACS, ETC. 



Fig. 213. 



deep fissures. They are constant in their occurrence, and are 



frequently supplemented by one or more smaller glands; each 



gland has the larynx on its inner 

 side, the 1 cna jn<ju fiiris externally, 

 the M. omohyoidem in front, and 

 above the mucous membrane of 

 the pharynx (Tolldt). 



b. Minute structure. The 

 glands consist of dense lymphoid 

 tissue (Fig\ 213), but possess in 

 addition one or more large bodies 

 (a) which resemble lymphoid fol- 

 licles in structure. Each is com- 

 posed of a dense mass of small 

 cells; and the whole follicle is, as 

 in similar follicles of higher ani- 

 mals, sharply differentiated from 

 the rest of the organ. 

 The glands possess an extremely rich vascular supply, and are 



frequently pierced by one or more large arterial trunks. 



The mucous membrane covering the glands is thinner than that 



immediately around, but is not perforated.] 



Part of section through the lymphatic gland 

 (tonsil?) ofJi/tna escitknta (Hartnack, Oc. I, 

 Syst. 13). G. H. 

 a Extremely large lymphoid follicle. 



[As far as I am aware, Tolldt is the only observer who describes these glands : he 

 makes no mention of the lymphoid follicles.] 



