"4 THE MUSCLES. 



M. mylohyoideus (Fig. 65, <;). The mylohyoid is a large 

 thin muscle seen after the reflection of the digastric, filling with 

 its fellow of the opposite side the whole angle between the rami 

 of the lower jaw. Its fibres are transverse. 



Origin from the middle of the medial surface of the body 



FIG. 67. MUSCLES OF TONGUE, HYOID BONE, AND PHARYNX. 



a. M. tragicus lateralis; b, M. jugulohyoideus; <", M. pterygoideus externus; ef, 

 partially cut surface of M. pterygoideus ir.ternus; e, M. styloglossus; f, M. genio- 

 glossus; g, M. geniohyoideus; h, M. hyoglossus; ?, M. glossopharyngeus; /, M. 

 constrictor pharyngis medius; k, M. constrictor pharyngis inferior; /, M. stylo- 

 pharyngeus; m. M. sternohyoideus (cut;; n, M. cricothyreoideus; o. M. sterno- 

 thyreoideus (cut); /. M. thyreohyoideus. I, mandible; i', angular process of 

 mandible; 2, stylomandibular ligament; 3, bulla tympani; 4, trachea; 5, oesophagus; 

 6, thyroid gland; 7, isthmus of the thyroid gland. 



of the mandible between the caudal opening of the mandibular 

 canal and the symphysis of the jaw. 



Insertion with the opposite muscle into a median raphe 

 which extends from the symphysis of the jaw to the hyoid bone 

 and is closely united to the external surface of the geniohyoid. 

 Some of the fibres gain insertion into the body of the hyoid 



