THE MUSCLES OF THE UPPER EXTREMITY. 153 



91. The interdsseous dorsalis is the outermost and 

 higher of the two delicate muscles that fill the long vacuity 

 existing between the index and medius metacarpal. 

 It is attached to the margins of the shafts of both these 

 bones, then sends obliquely downwards a slender tendon, 

 which lies flat against the radial side of the skeleton of 



o 



the hand, to be finally inserted at a point on the an- 

 terior aspect of the base of the distal phalanx of the 

 index digit. The contraction of this muscle extends 

 the lowermost finger-joint of the hand in the Raven. 



92. Hie interosseous palmaris l lies in the same vacuity, 



1 Gadow offers the following synonymy for the two interosseous 

 muscles I describe above, to wit : 



" 95. M. INTEROSSEUS DORSALIS. 



L'interosseux anterieur. Vicq d'Azyr, p. 577. 



Aeusserer Mittelhandmuskel (Interosseus externus.} Tiedemann, 



283 : Heusinger, p. 197, No. 39. 

 Innerer Strecker und Abzieher des zweiten Fingers. Meckel, p. 



350, No. 6. 

 Abzieher des Zeigefingers (Abductor phalangis secundce indicis). 



SchiJpss, p. 172, No. 46. 



Oberer Mittelhandmuskel (Vorleger der Lenkfeder.) Prechtl, 66. 

 Interosseux anterieur ou abducteur du medius. Milne- Edwards, pi. 



9, fig. 3. 



Interossevs. Selenka, p. 137, No. 69. 

 Interosseus II. ulnaris. De Man, No. 34. 

 Interosseux dorsal. Gervais et Alix, p. 30. 

 L'adducteur dorsal du deuxienie doigt. Alix, p. 419. 

 Interosseus dorsalis. Watson, p. 100 ; Carlsson, p. 25. 



" 99. M. INTEROSSEUS PALMARIS. 



L'interosseux posierieur. Vicq d'Azyr, p. 577. 



Innerer Mittelmuskel (Interosseus internus). Tiedemann, 284 ; 



Heusinger, p. 197, No. 40. 

 Aeusserer Strecker und Abzieher des zweiten Fingers. Meckel, p. 



350, No. 7. 

 Beuger des Zeigefingers. Schcipss, p, 173, No. 47. 



