MUSCLES OF THE HEAD. 



65 



outer portion (.?//) is an immediate continuation of the m 

 ahdominis, which passes into this 

 muscle at about the fifth i?iscrlp~ 

 fio tendinea. The muscle passes 

 forwards on the upper surface of 

 the coracoid and of the clavicle, 

 under tlie pericardium towards 

 the hyoid bone ; here the muscle, 

 hitherto horizontal, suddenly be- 

 comes (compare Fig". 60) ver- 

 tical, and passes between the 

 two insertions of the m. genio- 

 hyo'uleus, and is inserted for a 

 considerable length into the lower 

 surface of the hyoid bone and the 

 anterior extremity of the posterior 

 cornu. 



rectus 



21. M. owoliyo'ideva (Figs. 59, 



60 nh). 



Cuvier, I.e., p. 539. — Dugès, n. 18, 

 interscapulo-hyoidien ou omo- 

 hyoidien. — Zenker, p. 31. — 

 M. St. Ange, /. c. 



Arises from the anterior border 

 of the bony scapula, and is in- 

 serted into the outer part of the ventral surface of the body of the 

 hyoid : it is partially covered by the m. ftfernolii/oidens. 



Muscles of the tongue and of the hyoid bone of 

 Rana esculetda, from below. 



f/h M. geniohyoideus. 



!,h' External origin , ^^ ^^^,,^^_ 



<ih Internal oiigin j 



// Body of hyoid. 



H' Anterior cornu. 



//" Posterior cornu. 



A<7 M. hyoglossus. 



Ii(i' Hinder origin of same. ' 



oh M. omohyoideus. 



pli.i, 2, 3, 4, first, second, tliird, and fourth 



m. petrohyoideus. 

 .«/t M. sternohyoideus. 



22. M. jjetro////oidens cniferior (Ecker), (Fig. 61 pin). 



Dugès, 10, rupéo-cérato- hyoïdien. — Zenker, m. petro-cerau.^J P- 3°- — 

 Klein, basio-hyoidens, I. c, p. 71. 



A thin, flat muscle, narrow above, but broadening rapidly 

 below, which arising" from the outer extremity of the prootic 

 bone, partially surrounds the pharynx below, into which some of 

 its fibres are inserted ; it is attached to the ventral surface 

 of the body of the hyoid bone, near the lateral notch. The 

 chief action of this muscle appears to be that of a m. consfrictor 

 pharyngu. 



