162 DISSECTION OF THE DOG 



M. DiGASTEiCTjs. — Inasmuch as this muscle has only one fleshy belly 

 in the dog, the name ' digastric ' is apt to mislead. The strong muscle arises 

 from the jugular process of the occipital bone, and is inserted into the medial 

 surface and ventral border of the mandible. 



M. STYLO-HYOiDBtrs.— A thin and narrow fleshy slip crosses the surface of 

 the digastric muscle. This is the stylo-hyoid muscle, which has an attenuated 



^■i^ \<b>' .6.^ 



#• / ^^''> >* «^^ •." 





_^^r' a. temporalis superficial Is 

 ■; — a. auricularis posterior 



n. hypoglossus 



— a. carotis externa 



k- — a. occipitalis 



\ a, carotis interna 



^^w-,a. carotis communis 



^^' ", ' --^'''■-^''•^C ^^ ^^ , i ^) ' I ' ' 7^>^-' ^ linqualis 



_,^'' ^^"^ -cn:^ ^ ' ' / 1 I — ' — '"' — " laryngeiis cranialis 



m. gcnio-glossus ' '' j -^'^^t. ^ ---,^ / / f i i j, / /;^i,i^_, m tliyreo pharyngeus 



m.genio-l,yoiieus'' s,' /.//,,, " ^~ J / 1 " • '-- m cnco phanjngeus 



V ,-- ' \"J'/'/ //^ /'/ ; J 1 I "\ 



,^' / / ' / y^ I I V ^— _--'''' cranialis 



m. mylo-hyoideus "' ' i / j ^ ' ^Of^ ^ 



mhyoglossus' j < \ \ \ ^. _.,-- thyreoidea 



n. glosso-pharyngeus ', i i ' ""xv ^ - '"■■ -'"'' 



' ' ' \ X/' -• "v 



m. cerato-pharyngeus \ \ I i .;,, -. / 



a. maxillaris externa i / / >'' '\ \ 



m. chondro-pharyngeus i / / ' , \ ^. 



m. hyo-thyreoideus / / V^ «■ recurrens 



m. sterno-hyoidms / ^ 



rn. sterno-tliyreoideus 



Fig. 57. — Dissection of the tongue, pharynx, etc. 



tendinous origin from the point of union of the stylo-hyal with the temporal 

 bone, and an insertion into the body of the hyoid bone. 



M. STYLO-GLOSSTJS. — Long and flat in form, the stylo-glossal muscle will 

 be found medial to the digastric muscle and along the side of the tongue. 

 Arising from the stylo-hyal bone, its fibres are lost in the substance of the tongue. 



M. GENIO-GLOSSUS. — The right and left genio-glossal muscles are in con- 

 tact with each other in the median plane of the head. The ventral border 

 of each muscle extends from the symphysis of the mandible to the body of 

 the hyoid bone, and from it the fibres radiate into the substance of the tongue. 



