78 



ANIMAL MECHANICS. 



sum of the cross sections of the two great flexor tendons at 

 the heel, the chief increase taking place in the tendons of the 

 flexor digitorum longus. This increase is due to and represents 

 the force exerted by the accessory muscle, which joins the 

 flexor digitorum at its point of subdivision into the tendons 

 of the separate toes. 



The relative strengths of the tendons are, therefore, 



1. Flexor hallucis longus, . . .41 percent. 



2. Flexor digitorum longus, . . 40 ,, 



3. Accessories, 19 „ 



Total, . . 100 



If the whole force employed in flexion be called 100, as 

 above, it will be distributed to the toes in the following pro- 

 portions : — 



1. First toe, 41 per cent. 



2. Second toe, 15 „ 



3. Third toe, 18 



4. Fourth toe, 13 ,, 



5. Fifth toe, 13 „ 



Total, . . . 100 



Example, No. 2. — In this case, also, the Flexor hallucis was 

 found to supply the whole tendon of the first toe and part of the 

 tendon of the second toe ; while the Flexor digitorum supplied 

 the remaining portion of the second toe and the whole tendons 

 of the third, fourth, and fifth toes. 



The relative strengths of the several tendons were ascer- 

 tained to be — 



