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U.S. NATIONAL MUSEUM BULLETIN 2 73 



creasingly wider band along the walls of the larnygophar3nix (fig. 7). 

 They lie between the two lower constrictors and the palatopharyngeus. 

 Lateral bundles descend to the distal part of the thyroid lamina and 

 lesser horn on whose posterior borders they insert. I failed to clearly 

 demonstrate this attachment in a previous work (Schon, 1964a) and, 

 therefore, is described here. The stylopharyngeal fibers then said to 

 end on the mucosa of the laryngeal saccules are now regarded as 

 belonging to the middle pharyngeal constrictor. Medial and inter- 

 mediate fascicles end on the fibrous inner fascia of the pharynx. Both 



Figure 7. — Pharyngeal and lingual muscles (1, m. stylopharyngeus; 2, m. palatopharyngeus; 

 3, m. palatoglossus; 4, m. geniohyoideus; 5, m. genioglossus). 



Lampert (1926) and Sandifort (1834) recognized this muscle as strong 

 in the howler monkey. 



Nerve supply: Glossopharyngeal nerve. 



Function : Elevation of the larynx and constriction of the laryngo- 

 pharynx. 



Comparative anatomy of the glossopharyngeal group. — 

 Lampert (1926) describes m. stylopharyngeus in Ateles as being also 

 powerful and notes its presence in Lagothrix, but adds no more details. 



Vago -accessory Group 



M. constrictor pharyngis superior: It is shaped like a canal open 

 ventrally and has extensive origins from different structures at each 

 side of the midline. (1) A pars pterygopharyngea has its fleshy fascicles 

 arising from the inner surface of the pterygoid process (fig. 5) where 



