644 A MANUAL OF ANATOMY. 



The fifth and sixth digital arteries are both branches of the 

 communicating artery from the dorsum of the foot. The 

 sixth supplies the inner side of the great toe and anasto- 

 moses backward with the internal plantar artery ; the fifth 

 takes a forward course like the other digital arteries, di- 

 vides into two collateral digital branches at the web of the 

 toes and supplies the opposing sides of the great and second 

 toes. 



There are then six digital, and ten collateral digital ar- 

 teries, numbered from without inward. 



DISSECTION. 



Divide the tendon of the flexor longus digitorum just in front of the acces- 

 sorius and reflect it, with the lumbricales, forward. 

 Clean all the remaining muscles and tendons. 



The Third Layer. 



Flexor Brevis Hallucis (Ppllicis). Fig. 134. 



Origin. From the inner border of the cuboid bone, from 

 the under surface of the tendon of the tibialis posticus, over 

 the cuneiform bones. 



Insertion. By a divided tendon, one part with the ab- 

 ductor hallucis into the inner border of the base of the first 

 phalanx, the other with the tendon of the adductor hallu- 

 cis into the outer border of the same bone. A sesamoid 

 bone is found in each head. 



Nerve Supply. The internal plantar. 



Action. To flex the first phalanx of the great toe. 



The Adductor Hallucis. Fig. 134. 



Origin. From the plantar surface of the bases of the 

 second, third, and fourth metatarsal bones, and from the 

 sheath of the tendon of the peroneus longus. 



Insertion. Along with the outer head of the flexor 



