SOLE OF THE FOOT 301 



nerve. Sever also the tendons of the flexor digitorum longus and the 

 flexor hallucis longus at the point where they emerge from under cover of 

 the ligamentum laciniatum. Upon cutting the branch which is given by 

 the lateral plantar nerve to the quadratus plants these structures can be 

 thrown forwards towards the toes. On raising the lumbrical muscles, the 

 twigs which are furnished to the second ', third, and fourth by the deep 

 division of the lateral plantar nerve must be looked for. That for the 

 second lumbrical muscle will be seen to take a recurrent course around the 

 transverse head of the adductor hallucis muscle. Lastly, cut the medial 

 plantar nerve close to its origin and turn it aside. 



Third Layer of Muscles. The flexor hallucis brevis lies 

 along the lateral side of the abductor hallucis. 



The oblique head of the adductor hallucis (O.T. oblique 

 adductor of the great toe) has a very oblique position in the 

 sole, and hides to a great extent the interosseous muscles. 

 It lies to the lateral side of the flexor hallucis brevis. 



The transverse head of the adductor hallucis (O.T. transverse 

 adductor of the great toe) is placed transversely across the heads 

 of the metatarsal bones. 



The flexor brevis digiti quinti (O.T. minimi digiti] may be 

 recognised from its lying upon the fifth metatarsal bone. 



The deep division of the lateral plantar nerve and the 

 plantar arterial arch are partially exposed, but they will be 

 more fully displayed at a later stage. 



M. Flexor Hallucis Brevis. This muscle arises from the 

 os cuboideum and from the slip from the tendon of the tibialis 

 posterior muscle which goes to the intermediate and lateral 

 cuneiform bones. It is narrow and tendinous at its origin, 

 but it soon divides into two separate fleshy bellies, which are 

 ultimately inserted upon either side of the base of the 

 proximal phalanx of the great toe. In the tendons of 

 insertion two large sesamoid bones are developed. The 

 medial head of the flexor hallucis brevis is closely connected 

 with the tendon of the abductor hallucis, and is inserted in 

 common with it. The flexor hallucis brevis is supplied by 

 the medial plantar nerve. 



Adductor Hallucis (O.T. Adductor Obliquus Hallucis and 

 Adductor Transversus Hallucis). The adductor hallucis 

 consists of two separate portions called the oblique and the 

 transverse heads of the muscle. . The oblique head (adductor 

 obliquus hallucis) arises from the sheath of the peronaeus 

 longus muscle and from the bases of the second, third, and 

 fourth metatarsal bones. It tapers as it approaches the root 

 of the hallux, and is inserted, with the lateral head of the 



