380 Contributions to the 



From the above Table it will be at once remarked, that 

 in the human foot there are three muscles distributed uni- 

 formly to the corresponding phalanges of the four lesser 

 digits, which latter also are of nearly equal power and im- 

 portance ; while in the foot of the ape, this uniformity does 

 not exist, and the digits are more independent of each other, 

 the middle one being the strongest, as in the hand of man, 

 in adaptation to the prehensile function of the member. 



The Interossei on the dorsal and plantar surfaces were 

 not very distinct from each other, but the latter far exceeded 

 the former in size. 



Extensor brevis digitorum. In the Quadrumana this con- 

 sists of only three fasciculi, supplying the second, third, and 

 fourth toes as in man, the fasciculus supplying the first or 

 great toe being so distinct from the rest as generally to be 

 considered a separate muscle ; this is apt to cause confu- 

 sion in comparing dissections by different authors ; Traill 

 says the Extensor brevis digitorum sent tendons to all the 

 toes, but Tyson says it was wanting altogether. (?) 



Extensor brevis pollicis. Forms a distinct muscle in 

 most of the Quadrumana ; it is inserted as in man, but 

 has a more oblique direction on account of the angle 

 which the great toe forms with the side of the foot. 



Flexor brevis pollicis. Consists of two fasciculi as in 

 man, the tendon of the Flexor long-us running between 

 them. I did not note the origin of the internal head which 

 is inserted with the Abductor pollicis, but the external or 

 deep-seated portion appeared to come from the internal 

 cuneiform and partly from the metatarsal bone, and the 

 two heads were rather more distinct than in man. Vrolik 

 describes but one fasciculus, but generally tht^re are two. 

 In Owen's Orang, the channel usually filled by the tendon 

 of the long fiexor was occupied by a small, short flexor 

 arising upon the metatarsal bone, and inserted into the 

 first phalanx. 



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