MUSCLES OF THE ANTElllOK EXTREMITY. 89 



71. M.jiexor âujïtl II b rev is s. pvofiindim (Fig-. ']'] fOz). 



Dugès, sous-carpo-phalaugien de l'index, n. 102. 



This flat muscle^ covered by the preceding-, has a tendinous origin 

 from the pahnar surface of the os cajjifato-Iiainaf^oii, together with 

 one head of the jlexor suhlims, and is inserted into the basal 

 phahxns. 



72. BLjle.ror dujlti II tertius (Fig. 78 /J2'). 



Dugès, tendini-phalangien de l'index, n. 103. 



A smallj thin muscle which arises close to the foregoing from the 

 OS capitato-Jianiatum, and is inserted into the basal phalanx (see 

 below, m. iuterossem rolarix I). 



IZ. M. adductor dujlti II {Fig. 78 adz). 



Dugès, métacarpo-uiétacarpien de l'index, n. 90. 



This muscle represents the adductor poUicis of man ; it arises from 

 the base of the third os metacarpal and is inserted into the metacarpal 

 of the second finger, which latter it draws towards the third finger. 



74. M. opjjoneus dlrjiii II (Figs. 77 and 78 0). 



Dugès, sous-carpo-métacarpien de l'index, n. 90. 



This muscle represents the muscle of like name in man. It arises 

 from the palmar process of the os capitato-hamatum by a narrow 

 tendon and passes into a broad, flat muscle, which is inserted into 

 the under surface and outer border of the metacarpal of the second 

 finger throughout its length. It has, undoubtedly, the same action 

 as the corresj)onding muscle in man. 



(4) Muscles of the third finger. 



75. M. flexor digiti III longus s. sublhiiis (Fig. ']'] f'^)- 



The smaller portion of this muscle arises from the free border of 

 the aponeurosis palmaris, the chief portion, together with the jîexor 

 brevis, from the palmar surface of the 0* cajntato-haviatum. The 

 two portions pass into one long tendon, which is inserted into the 

 last phalanx. 



76. 77. MM. jlcxores digiti III breves s. ^rrofundi I, II (Fig. 

 11 fH and A3'). 



Dugès. tendini-phalangiens du médius, n. 104, 105. 



These two muscles arise in part from the free border of the apo- 

 neurosis p)alinaris., in part fi'om the volar surface of the os capitato- 

 Jiamatnm, and pass backwards on either side of the muscle last 

 described, to be inserted into the basal phalanx. Dugès regards 

 these as analoo-ues of the mw. bimJjrica/cs. 



