THE MUSCLES in 



M. extensor tarsi tibialis (m.e.t.t.). Ribbing (i 909). 



Rotateur inverse du pied (92) ..... Perrin (1892). 



Extensor tarsi tibialis longus ..... Eisler (1895). 



Together with M. extensor cruris tibiahs == 



Tibialis anticus . Funk (1827); Schmidt, Goddard, and van d. Hoeven 



(1864); Humphry (1872). 

 Abductor et flexor pedis +introflexor pedis (39). . Carus (1828). 



Femoro-tibialis ...... Hoffmann (1873-8). 



Tibialis .... Osawa (1902); Sieglbaur (1904). 



This is a small muscle which arises from the epicondylus lateralis 

 jemoris very close to, or from a common tendon with, the M. ext. 

 dig. comm. Although its origin is slight, the fibres soon swell into 

 a spindle-shaped muscle of moderate size which passes alongside 

 the M. extensor cruris tibialis to be inserted on the ventral surface 

 of the tibiale and cart, pre-hallucis. It is easily separated from the 

 neighbouring muscles, and in this respect differs from the corre- 

 sponding muscle in the fore-arm. It is a fairly superficial muscle 

 but is partly covered by the M. ext. dig. communis. 



Perrin homologizes this muscle with Hoffmann's M. fibulae 

 metatarsum II and Humphry's M. supinator pedis, admitting the 

 discrepancy between the origin and insertion of the muscle described 

 by the German and English authors and of the one which he himself 

 describes. There does not appear to be a muscle in the Salamander 

 which exactly corresponds with Humphry's supinator pedis, perhaps 

 the nearest being the M. abductor digiti I. This muscle admittedly arises 

 from the intermedium, and not from the fibula, but it is inserted on 

 the metatarsal and /j joined to the M. extensor digiti brevis superior I. 

 Further, it is definitely a muscle of the deep stratum, while the 

 rotateur inverse du pied of Perrin is rather to be associated with the 

 superficial muscles, and in Cryptobranchus (Menopoma) Eisler 

 figures the muscle as actually arising from the fibula as well as from 

 the intermedium (Eisler 1895, ^'^^- ^^^' ^&- ^5' 7 ^)- ^^^^ absence 

 of figures in Hoffmann's account renders identification difficult, 

 but there can be no doubt that his description in general has been 

 largely influenced by Humphry's, and that the identification of 

 Hoffmann's M. fibulae-metatarsum II with Humphry's M. supinator 

 pedis is sound. 



It seems, therefore, probable that Perrin's M. rotateur inverse du 

 pied is included by Humphry in his 'Tibialis anticus passing to 

 tarsus', and by Hoffmann in his M. femoro-tibialis. 



Innervation: From N. dorsalis pedis intermedius. 



Function : It tends to turn the foot into the supine position. 



