I 12 



THE MUSCLES. 



process for about one centimeter into a fascia common to it and 

 the masseter muscle, and into the stylomandibular ligament. 

 Relations. — Ventral surface with the styloglossus and the 



Fig. 66. — Obliquely Ventral View of the Deep Muscles of the Lower 



J.vw AND Palate. 



The tongue and otiier structures forming the floor of the mouth liave been re- 

 moved, showing the roof of tlie mouth. On the right side the masseter and ptery- 

 goideus internus have been removed, a, a', M. masseter; /', M, pterygoideus ex- 

 ternus; c, M. pterygoideus internus; d, </', M. tensor veh palatini; e, e' , M. levator 

 veh palatini; f^ M. constrictor pharyngis superior, i, aponeurosis of the velum 

 {lalatinuin; 2, ridges formed by the palatines and jiterygoid portions of the sphenoid; 

 3, hainular processes; 4, free caudal border of the velum paiatinum; 5, bulla tym- 

 pani. 



soft palate. Dorsal surface with the bulla tynipani (s) and 

 base of the skull. Cranial surface with the pterygoideus 

 externus {b), with which it is partly united. 

 Action. — Assists the pterygoideus externus. 



{b) AIiiscU's of tJic Hyoid Bone. 



M. stylohyoideus (Fig. 65, d). — The stylohyoid is a 

 ribbon-like muscle about three millimeters wide. It lies on 



