64 



THE MUSCLES. 



IV. Muscles of the Hyoid Bone and the Tongue. 



19. M. geniohyoidevs (Figs. 59 cjh, 60 (jli). 



Cuvier, IV, i, 536. — Dugès, n. 16. — Zenker, p. 30. — M. St. Ange, I.e., 

 PI. XXVI,' f. I, 13, p. 423- 



Arises from the lower jaw in two portions, the one from near 

 the middle line above the rn. svhnieiifalis, the other more externally 



from the upper border of the 

 lower jaw. The two parts unite 

 to form a long-, flat muscle, 

 which lies on the ventral sur- 

 face of the body of the hyoid 

 bone, and divides posteriorly 

 into two portions. One of these, 

 the median (Figs. 59, Gogh"), 

 is inserted into the inner border 

 of the posterior horn of the 

 hyoid bone, and is here attached 

 to a fascia which covers the tn. 

 ?ri/oglossns from beneath. By 

 the same fascia the muscles of 

 opposite sides are connected 

 in the space between the two 

 posterior cornua. The lateral 

 division (Figs. 59, 60 gl/) is 

 attached to the posterior carti- 

 laginous process of the hyoid 

 bone. 



Muscles of the hyoid bone and the tongue of Rana 



esciilcnta. 



Tlie m. subraaxillaris has been removed close to 



its insertion. 



cm' Origin of the hinder portion of same from 



the hyoid bone. 

 fill M. geniohyoideus. 

 tfh' External portion of same. ' 



fih" Internal portion of same. 

 // B( idy of hyoid bone. 

 H' Anterior horn. 

 h(i M. hyoglossiis. 

 oh M. omohyoidens. 

 ph Mm. jietrohyoidei. 

 sh M. sternohyoideus. 

 sh' External origin of same. 

 sh" Internal origin of same. 

 sm M. subraaxillaris. 

 sm' Origin of hinder portion of same. 

 smt M. submentalis. 



20. M. sfer7ioJ/f/oifle7(S (Figs. 



59, 60 .SÏÏ). 



Cuvier, IV, i, 538 {puhio-hyoi- 

 deus). — Dugès, n. 17, sterno- 

 xiphe-hyoidien. — Zenker, p. 30. 



This muscle forms the cer- 

 vical part of the m. rectus 

 abdominis and is, in fact, a direct continuation of it. It arises by 

 an inner portion (Fig. 59 sh") from the upper surface of the inner 

 extremity of the coracoid and from the xiphisternum, while the 



