66 



THE MUSCLES. 



23, 24, 25. J////. petrolymdei posteriores (Ecker), (Figs. 61 



Cuvier, mm. stylohyoidei, I.e., p. 537. Duges, 20, 21, 22, masto-hyoi- 

 deus (Fig. 4). Zenker, petro-hyoideus superior and inferior. 

 Klein, stylo-hy 'oidens, I. c., p. 18. 



These are three long, thin muscles, which lie nearly parallel to 

 one another, and niri from the prootic bone to the posterior cornu 



of the hyoid bone. All three arise, 

 Fl - 6l - covered by the m. sternocleidomastoi- 



deus, from the lateral extremity of 

 the prootic, pass round the pharynx 

 and are attached, the m. petrokgoideus 

 posterior primus (Fig. 61 phz} to the 

 anterior extremity, the secundns (Fig. 

 6 1 ph 3) to the middle ; and the tertiits 

 (Fig. 6 1 p/t-4) to the hinder extremity 

 of the posterior horn of the hyoid 

 bone. 



P h 



6 1 



26. M. hyoglossvs (Figs. 59, 60,- 



Mus-cles of the hyoid bone of HHIKI c.i,-ii- 

 lentii, seen from the right side and 

 bdow. 



//' Anterior cornu. 

 If Posterior cornu. 

 hff M. hyoglossus. 

 // // B(5dy of liyoid bone. 

 ph i M. petrohyoideus anterior. 

 phz, 3.4 Mm. petrohyoldei porteriores. 

 sm M. s>ibmaxillaris. 

 xii:' Hinder portion of same. 



Cuvier, /. c., p. 588. Duges, 24, hyo-glosse. 

 Arises from the bony posterior ex- 

 tremity of the hinder process of the 

 hyoid bone (///). The muscles of the 

 two sides pass forwards and converge 

 to the middle line, where they unite. 

 The azyg-os muscle thus formed runs 

 forwards on the ventral surface of the 



hyoid bone, between the mm. geniohyoidei, over the anterior border 

 of the hyoid, and passes into the tongue, where it turns backwards 

 and runs to the tip. (For action, see tongue.) 



2 7 .. M* ye n ioglos&u $+ 



Cuvier, I. c., p. 587. Meckel, /. c., IV, 339. Duges, 23, genio-glosge. 

 Arises above the insertion of the m. geniohyoidens on either side 

 near the middle line from the two anterior bones of the lower jaw. 

 The two origins quickly unite to form a thick, very firm muscular 

 belly, which in its course backwards rapidly thins, and is distributed 

 by numerous bundles ; decussating with the fibres of the m. Iti/oijloxxiis 

 at an acute angle, it runs on to the anterior extremity of the tongue. 



