Mrsi'I.KS 'F THE ANTERIOR EXTREMITY. 83 



95. M. extensor dig. Ill prop rlus. 



Duges, sus-luno-phalangettien du medius, n. 122. 



This muscle has two heads of origin, from the ox navicvlare and 

 hmatniii. These form one muscular belly, which rapidly diminishes 

 and passes into a tendon ; this, after receiving a few muscular 

 fibres from the second metacarpal, runs to the outer part of the 

 dorsal surface of this finger as far as the terminal phalanx, where it 

 is inserted. 



96. 31. extensor dig. IV prr>p?in*. 



Duges. Jiis-pyro-phalangettien de I'annulaire. n. 128. 



By a somewhat broad base, this muscle arises from the o# navi- 

 cv.fare and Innatum. The tendon receives fibres from the fourth 

 metacarpal and runs on the outer half of the dorsal surface of this 

 finger as far as the middle phalanx, where it is inserted. 



(III.) 3131. intero**ei. 



97. 98. [a.] 3I3[. tran*ver*i metacarpi (Ecker), (Fig. 78 /, t', ail 2}. 



These lie transversely between the metacarpals. There are three ; 



the first has been already described as ///. a<l<luctor digiti II (n. 73) ; 



the second is stretched between the third and fourth metacarpals, 



and the third between those of the fourth and fifth fingers. 



99, 100. 101. [b.] JLlf. Intei-n.-xt'i rolarex. 



One may regard as such, four long, thin muscles, which take 

 origin near one another on the palmar surface of the carpal bones, 

 and diverge from this towards the second and fifth fingers. 



T. The first of these muscles (Fig. 78/^2') has already been 

 described above as the m.jltMcor ilif/ifi II tertin* (n. 72). 



2. The second (Fig. 78 /3) passes from the origin already de- 

 scribed to the palmar surface of the basal phalanx of the third 

 finger. 



3. The third (Fig. 78 74) runs, in like manner, to the fourth 

 finger. 



4. The fifth (Fig. 78 /5) to the fifth finger 1 . 



102 to 108. 3131. tuferotsei tlorsalex. 



These arise in common from the metacarpals, and are inserted 

 into the basal phalanx of the corresponding surface on the finger. 



these muscles may be regarded as mm. iuterosnei is open to discussion, 

 as they appear to act more as >nm. 



