68 THE SALAMANDER 



Levator maxillae inferioris brevis Schmidt, Goddard, and van d. 



Hoeven (1864). 

 Thoracico-hyoideus .... Hoffmann (1873-8). 



Retracteur de I'hyoide ...... Perrin (1892). 



This muscle represents the direct forward continuation of the M. 

 rectus abdominis, as Cuvier's name indicates, and, like that muscle, 

 it is divisible into two strata, one superficial and the other deep. 

 These two layers will be dealt with separately. 

 M. rectus cervicis superficialis (Edgeworth) (m.r.c.'). 



Rectus V. Siebold (1828). 



Sterno-hyoideus superficialis .... Fiirbringer (1873). 



Rectus superficialis hypobranchialis s. Sterno-hyoideus Druner (1901). 

 With M. rectus abdominis superficialis = 



Abdominis musculus rectus (8) .... Carus (1828). 



The superficial stratum of the M. rectus cervicis may be regarded 

 as arising from the sternum and from the transverse inscription con- 

 tiguous to it. It passes anteriorly, dorsal to the coracoids and ventral 

 to the pericardium, as a broad thin sheet of muscle. It has at least 

 three insertions: (i) at the angle formed by the hypobranchial i 

 with the copula; (ii) on the tendon of insertion of the profundus 

 portion of the muscle by a small deep bundle. The above-mentioned 

 insertions apply only to the more lateral portions of the muscle; the 

 mesial fibres are attached (iii) to the os triangulare and to the in- 

 scription from which the M. genio-hyoideus arises. Between the 

 sternum and the hyobranchial skeleton there are two transverse ten- 

 dinous inscriptions, and at the anterior of these the M. pectori- 

 scapularis is inserted. It is very closely attached to the pericardium 

 (see also p. 270). 



Innervation : The muscle is supplied by twigs from each of the 

 first three spinal nerves. 



Function: The mesial fibres support the M. genio-hyoideus, while the 

 lateral fibres assist the rectus cervicis profundus in retracting the 

 tongue. 



M. rectus cervicis profundus (Edgeworth) (m.r.c"). 



Hebosteoglossus ...... v. Siebold (1828). 



Sterno-hyoideus profundus .... Fiirbringer (1873). 



Rectus hypobranchialis profundus s. Abdomino-hyoideus Druner (1901). 

 With M. rectus abdominis profundus = 



M. epischio-hyoideus (7) ..... Carus (1828). 



As already indicated, this muscle forms the direct forward continua- 

 tion of the M. rectus abdominis profundus, so that it is a moot point 

 to speak of its 'origin'. By analogy with the superficial portion it is 



