THE ALIMENTARY CANAL. 229 
gaining insertion into the integument at the sides’ of the 
tongue. 
Relations. —Outer surface with the digastric (Fig. 65, 4) 
and mylohyoid (Fig. 65, c). Inner surface with the ptery- 
Fic. 96.—Muscies oF Toncugz, Hyon Bong, AND PHARYNX. 
a, M. tragicus lateralis; 4, M. jugulohyoideus; c, M. pterygoideus externus; d, 
partially cut surface of M. pterygoideus internus; ¢, M. styloglossus; 7, M. genio- 
glossus; g, M. geniohyoideus; 2, M. hyoglossus; z, M. glossopharyngeus; 7, M. con- 
strictor pharyngis medius; 4, M. constrictor pharyngis inferior; 4, M. stylopharyngeus; 
m, M. sternohyoideus (cut); 7, M. cricothyreoideus; 0, M. sternothyreoideus (cut); 
~, M. thyreohyoideus. 1, mandible; 1’, angular process of mandible; 2, stylo- 
mandibular ligament; 3, bulla tympani; 4, trachea; 5, cesophagus; 6, thyroid gland; 
7, isthmus of the thyroid gland. : 
goideus internus (Fig. 96, @), the cranial cornu of the hyoid, 
and the tympanic bulla. 
Action.—Retracts the tongue and raises it. 
The intrinsic muscles of the tongue (those entirely within 
it) are attached to its integument at both their ends. There 
are three sets of fibres: a longitudinal, a transverse, and a ver- 
tical one. These are seen most readily in cross-sections. 
The SOFT PALATE. VELUM PALATINUM (Fig. 66, page 
