590 BLOODVESSELS OF THE ALIMENTARY CANAL, BY C. TOLDT. 



secondary papilla. The capillary has a diameter of about 0*01 

 millimeter, and runs to the apex of the papilla, where it forms 

 a loop, and, reversing its course, unites with others to form a 

 venous trunk. The large papillae contain two or more venous 

 trunks. The larger and smaller papillae of the same variety, as 

 well as the three subordinate forms of the papillae, are not in 

 any way distinguishable from one another by the arrangement 

 of the bloodvessels, but essentially by the greater or less de- 

 velopment of the vascular plexus, and the number of loops that 

 are given off in each instance in correspondence with the num- 

 ber of the secondary papillae. 



The veins of the papillae, which are of considerable size in 

 the circumvallate variety, run vertically downwards, and form 

 by their junction with those from other papillae, and by their 

 frequent anastomoses, a beautiful venous plexus situated between 

 the terminal expansion of the arteries and the fascia linguae. 

 The meshes of this plexus are usually rounded in the anterior 

 part of the tongue ; the larger trunks arising from it penetrate 

 the fascia, and, running side by side with the arteries, receive 

 numerous veins from the muscles, and dip into the substance of 

 the organ, where they coalesce to form the large venous trunks. 

 In the posterior part of the tongue, numerous large veins take 

 origin from the above-mentioned venous plexus, and, after run- 

 ning for some distance backwards on the fascia, combine at the 

 root of the tongue to form the venae dorsalis linguae. The pos- 

 terior parts of the mucous membrane of the tongue are conse- 

 quently extraordinarily rich in veins. 



It only remains to be mentioned that both the arterial and 

 venous system of the mucous membrane of the right and left 

 halves of the tongue are everywhere in direct communication 

 at the median line. 



SACCULAR GLANDS OF THE MOUTH AND PHARYNX, AND 

 THE TONSILS. 



Arterial branches penetrate at various points through the 

 fibrous sheath of the saccular glands into their interior, and 

 give off branches which supply the adenoid substance. Where 

 this last is distinctly divided into follicles, the capillaries are 



