494 ORGANS OF DIGESTION. 



hyo-glossus, and the Lingualis. As these, besides belonging to 

 the general muscular system, also form so important a part of 

 this organ, with a view of collecting the account of its struc- 

 ture, their description will be repeated. 



1. The Stylo-glossus arises from the styloid process of the 

 temporal bone, and soon reaches the side of the base of the 

 tongue. Some of its fibres extend to the tip and confound 

 themselves along with those of the superficial lingual muscle, 

 above and below the margin of the tongue: while others form a 

 broad transverse fasciculus, which is united to the correspond- 

 ing portion of the other side in the region of the greater pa- 

 pillae.* 



2. The Hyo-glossus arises from the side of the base of the os 

 hyoides, from its cornu; and from its appendix, in a slight degree. 

 It is placed within the stylo-glossus, and extends forwards to 

 the tip of the tongue. Some of its fibres go as far as, the mid- 

 dle line of the tongue; others rise almost perpendicularly up- 

 wards to its base; while the remainder are confounded, along 

 the margin of the tongue, with the superficial lingual muscle. 



3. The Genio-hyo-glossus arises from the tubercle on the 

 posterior face of the symphysis of the lower jaw, and imme- 

 diately after its origin spreads itself after the manner of a fan. 

 Its inferior fibres are inserted into the base of the os hyoides, 

 while the remainder, by their diverging, are inserted into the 

 whole length of the tongue from its base to its point. This 

 muscle is in contact, side by side, with its fellow, and there is 

 a sort of fissure with a small quantity of adipose matter be- 

 tween them. 



As the fibres of this muscle go from below upwards, they pe- 

 netrate to the upper surface of the tongue; and, consequently, 

 traverse the transverse lingual muscles and the superficial lin- 

 gual. 



4. The Lingualis is a small narrow fasciculus of fibres, which 

 arises indistinctly about the root of the tongue, in the yellow 



* See Cloquet's Anat. pi. CXX. 



