;78 



THE MUSCLES 



First Layer 



1. ABDUCTOR HALLUCIS 



The abductor hallucis — nanu-(l from its action upon the great toe — is a thick 

 triantrular sheet, with a hroad oriuin Ix'hind, Avhich is divided into two heads. 



Origin. — Outer head : ( 1 ) Tlie front and inner surfaces of the inner or greater 

 tubercle on the uncka- surface of the calcaneuni; (2) the deep surface of the inner 



Fia. 293.— FiKST Layer of the Muscles of the Sole. 



I 



Abductor minimi digiti 



Flexor brevia minimi digiti 



Tendon of flexor longus digitorum 



Flexor brevia digitorum 



Abductor hallucis 



Flexor longus hallucis 



Flexor brevia hallucis 

 First lumbricalis 



— Tendon of adductor hallucis 



j.ortion of tlie ])lantar fascia; (3) tlie intern luscular septum Avhich separates it 

 from the tiexor hrevis (hgitorum. Inner head : ( 1 ) The deep aspect of the kiwer 

 lionk^of tlie internal amuilar ligament; (2) the under surface of the attachment 

 of the tendon of the tihialis posticus to the tuberosity of the scaphoid bone and the 

 adjacent prolongations of this tendon. 



Insertion. — The inner part of the lower surface of the base of the first ])halanx 

 of the great toe and the inner side of the internal sesamoid bone. Occasionally, 

 also, the inner l)order of the expansion of the extensor proprius hallucis on the 

 back of the first ])halanx. 



Structure. — The outer head arises in close connection with the flexor hrevis 

 digitorum by short tendinous fibres, soon succeeded by a divergent fleshy bundle 

 wiiich is joined about two inches (5 cm.) from its origin l)y tlie fleshy sheet formed 



