118 



the Sterno-glossus. It is inserted by a strong attachment, 

 forming the back of the tongue. In front of the hyoid 

 bone, the muscle has a loose, membranous portion, which 

 in advance of the stylo-hyal forms a part of the back of the 

 mouth. The object of this muscle, is to press the base of 

 the tongue against the roof of the mouth. 



. It also may, by binding against the Sterno-glossus, form 

 a firm attachment for the Sterno-glossus, on the posterior 

 part of the tongue. The Sterno-glossus may then act to 

 draw this part of the tongue backward. When the base 

 of the tongue is brought against the roof of the mouth, 

 the Genio-glossi and the Sterno-glossi act in different di- 

 rections, drawing the tongue back and forth. 



M. Annulus Intimus. 



A second circular muscle below the Annulus Inferior 

 binds down the Sterno-glossus to the Pharyngo-glossus. 

 It appears to be simply a continuation and enlargement of 

 the proper circular muscles of the tongue. It has an ori- 

 gin from the lateral aspect of the back of the tongue, and 

 also from the base and median, ventral line. It forms a 

 loop, through which the Sterno-glossus acts, firmly bind- 

 ing it in place. 



Three pair of muscles serve to draw that portion of the 

 base of the tongue, which is armed with teeth, forward. 

 They belong to the same layer as the Genio-glossi, and the 

 lower seems to be continued into them. Of these three 

 muscles one is inserted into the outer side of the base of 

 the tongue, above the Annulus Intimus. Two also are sit- 

 uated on the inner side of the origin of the same muscle. 



To these muscles, I give the names M. Genio-glossus, 

 Posticus Exteruus, and M. Genio-glossus Posticus Inter- 

 ims. 



Below the last mentioned muscle, there is a continuation 



