ANATOMY OF CACOPUS SYSTOMA. 



Text-figure 16 (A, B, C, D, and E). 



549 



A 



ST.2r- 



A. The deep muscles of the liyoid and of the floor of the mouth. The snb- 

 mentalis has been taken away. The stemo-Jiyoideus muscles on the right side 

 have been severed at their origins and deflected while those on the left have 

 been removed. O.G.. an outer division of the geniohyoideus ; I.G., an inner 

 one of the same ; I.G'., a fused median portion of I.G. ; I.G.", a posterior 

 offshoot of I. G.' concealing a hyoglossus below ; S.C, sterno-cornuoideus ; S.C, 

 cut end of the same. For other letters consult the key-list of abbreviations. 



B. The deep muscles of the hyoid continued ; the genioliyoidev,s muscles have been 



removed excepting those fibres of I.G.' and I.G." at their insertion (G.") which, 

 as will be seen, is a parabolic curve. ST.l and ST. 2, the two divisions of the 

 "outer portion of the stemoJii/oideus" or the " sternohyoideus proper." P.A.I, 

 an anterior division of the ■petrohyoideus ; O.G.', cut end of the outev genio- 

 hyoideus ; ST.', cut ends of the sieriioliyoideus muscles ; F., fascia ; H., hyo- 

 glossus. Other letters as in A. 



C. The same muscles continued. The hyoglossus in the region of the basihyal has 



been cut away. C^.," cornuoideus-posterior" ; H'., cut end of the azygous 

 hyoglossus; P. A., petrohyoideus-anterior ; P.A.I, an anterior division of the 

 latter. The remaining letters as in the other figures of this text-figure. 



D. The same muscles continued. The " cornuoideus-posterior " has been removed. 



P.A.2, P.A.3, and P.A.4, the several bundles into which the petrohyoidezis- 

 anterior separates itself before its insertion ; P.P., petrohyoidews-posterior. 

 For other letters consult the key-list of abbi-eviations. 



E. Certain muscles of the tongue viewed from below. The median and azygous 



part of the genioglossus (G.G.) has been cut in the middle in order to expose 

 the muscle G.G.', which corresponds to the outer portion of the genioglossus, 



38* 



