FEOG 223 



Notice that posteriorly it divides into two por- 

 tions. 



c. The sternohyoid, its anterior end lying between 

 the divisions of the geniohyoid. What is the rela- 

 tion of the sternohyoid to the rectus abdominis? 



d. The hyoglossus, uniting in the median line 

 with its fellow, and partly covered by the genio- 

 hyoid. Study the relation of this muscle to the 

 tongue. 



e. The submeutalis, at the anterior angle of the 

 lower jaw. 



f. The petrohyoids, four small muscles running 

 from the auditory capsule to the hyoid bone. 

 On the side of the head find 



g. The masseter, lying immediately in front of 

 the union of the upper and lower jaws. 



A. The temporalis, running down between the eye 

 and the auditory capsule. 



i. The pterygoideus, under the temporalis. 



Make lists of the muscles which (1) increase 

 the size of the cavity of the mouth ; (2) move 

 the tongue ; (3) raise the hyoid bone ; (4) raise 

 the lower jaw. 



CarefuUy cut away the three muscles men- 

 tioned above, lay the frog on its back, remove 

 the lower jaw and the mucous membrane of the 

 roof of the mouth, and find the eye muscles, con- 

 sisting of 



j. The levator bulbi, a sheet of muscle lying be- 

 tween the eyeball and the mucous membrane. 

 What important use has this muscle ? 



