IT4 THE MUSCLES. 
M. mylohyoideus (Fig. 65, c).—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 
Fic. 67.—MuscLes oF Toncur, Hyorp Bone, AND PHARYNX. 
a, M. tragicus lateralis; 4, M. jugulohyoideus; ¢, M. pterygoideus externus; d, 
partially cut surface of M. pterygoideus internus; ¢, M. styloglossus; 7, M. genio- 
glossus; g, M. geniohyoideus; 2, M. hyoglossus; 7, M. glossopharyngeus; 7, M. 
constrictor pharyngis medius; %, M. constrictor pharyngis inferior; 4, M. stylo- 
pharyngeus; 7, M. sternohyoideus (cut); 2, M. cricothyreoideus; 0, M. sterno- 
thyreoideus (cut); #, M. thyreohyoideus. 1, mandible; 1’, angular process of 
mandible; 2, stylomandibular ligament; 3, bulla tympani; 4, trachea; 5, cesophagus; 
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 
