THE TONGUE. 11 



genio-glossus, in the middle. Its coarser bundles, in fact, break 

 up when they have reached the lower surface of the margin of 

 the tongue, into a great number of thin transverse lamella, 

 which, more or less curved, penetrate superiorly between the 

 lamella of the transverse muscle and in their further course, 

 present exactly the same relations as those of the genio- 

 glossus, to which they are applied externally, except, that as 

 their fibres ascend towards the dorsum of the tongue, they 

 take a slightly oblique direction inwards. Upon the dorsum of 

 the tongue, the hyo-glossus lies between the genio-glossus and 

 the upper edge of the transversus ; it presents, like the former, 

 longitudinal plates, with perpendicular fibres, between which 

 the upper longitudinal fibres lie, and it finally, also, terminates 

 in the mucous membrane. The expansion of the hyo-glossus 

 is most distinct and strongest, in the middle of the tongue, 

 where the chief mass of the baseo-glossus lies; it is only 

 behind that it becomes more indistinct, the lamella of the 

 cerato-glossus being here very delicate, and lying more horizon- 

 tally; however, they still penetrate between those of the 

 transversus and terminate upon the dorsum of the tongue. 



The stylo-glossus (fig. 170, st. gl.), in general, divides into two 

 bundles, which have totally different relations; the posterior, 

 smaller one, passes between the cerato-glossus and baseo-glossus, 

 and between the fasciculi of the latter, directly inwards, pene- 

 * trating, in a few bundles, between the lamella of the lingualis 

 and genio-glossus, as far as the septum lingua, where it becomes 

 attached, in common with the somewhat superior fibres of the 

 transverse muscle. The principal mass of the stylo-glossus passes 

 inwards and downwards at the margin of the tongue, unites in 

 front of the hyo-glossus with the lingualis inferior, and terminates 

 in the mucous membrane of the lower surface of the apex of the 

 tongue and of the point itself; the anterior bundles of the 

 two muscles becoming united in an arch. 



The lingualis of authors, which I shall call lingualis or Ion- 

 gitudinalis inferior (fig. 170, Li), is a tolerably strong, longitu- 

 dinal bundle of muscular fibres placed upon the lower surface 

 of the tongue, between the genio-glossus and hyo-glossus, but 

 whose commencement and termination are not readily disco- 

 verable. The posterior portion of the lingualis inferior appears 

 at first to become lost in numerous superimposed flat bundles 



