THE /1LIMENTARY 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- 



FlG. 9O. — MuscLiis OF Tongue, IIyoid Bone, and Pharynx. 



a, M. tragicus lateralis; /', M. jugulohyoideus; r, M. pteryp;oideus externus; d, 

 partially cut surface of M. pterj'goideus internus; e, M. styloglossus; f, M. genio- 

 glossus; g. M. geniohyoideus; h, M. hyoglossus; i, M. glossopharyngeus; y', M. con 

 stricter pharyngis medius; /(-.M. constrictor pharyngis inferior; /,M.styloph;uyngeus 

 in, M. sternoliyoideus (cut); «, M. cricothyreoideus; o, M. sternotliyreoideus (cut) 

 /, M. thyreoliyoidous. 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, d), the cranial cornu of the hyoid, 

 and the tympanic bulla. 



Action. — Retracts tlie 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 



