THE ALIMENTARY CANAL. 229 



gaining insertion into the integument at the sides of the 

 tongue. 



Relations. Outer surface with the digastric (Fig. 65, b} 



and mylohyoid (Fig. 65, c). Inner surface with the ptery- 



FIG. 96. MUSCLES OF TONGUE, HYOID BONE, AND PHARYNX. 

 a, M. tragicus lateralis; b, M. jugulohyoideus; c, M. pterygoideus externus; d, 

 partially cut surface of M. pterygoideus internus; ^, M. styloglossus; _/", M. genio- 

 glossus;^-, M. geniohyoideus; h, M. hyoglossus; z, M. glossopharyngeus ; /, M. con- 

 strictor pharyngis medius; k, M. constrictor pharyngis inferior; /, M. stylopharyngeus ; 

 m, M. sternohyoideus (cut); , M. cricothyreoideus; 0, M. sternothyreoideus (cut); 

 /, M. thyreohyoideus. I, mandible; i', angular process of mandible; 2, stylo- 

 mandibular ligament; 3, bulla tympani; 4, trachea; 5, oesophagus; 6, thyroid gland; 

 7, isthmus of the thyroid gland. 



goideus internus (Fig. 96, f), 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 



