380 



THE MUSCLES 



tulxTcle of the calcanciun and the adjacent i)()rti<)n of the under surface of that 

 Ijone in front of the <ire;it tul)ercle; (2) the upi)er surface of the l)ack part of the 

 outer division of the i)lantar fascia; (3) the outer surface of the back ])art of the 

 external intermuscular septum; (4) the long plantar ligament and other ligamen- 

 tous structures lying upon the outer border of the sole, and more especially an 

 aponeurotic band which runs from the outer side of the lesser tubercle of the cal- 

 caneum to the outer side of the base of the fifth metatarsal bone, and of the base 

 of the first phalanx of the fifth toe. 



Insertion. — (1) The outer part of the under surface of the base of the first 

 ])halanx of the little toe; (2) usually also the outer part of the under surface of 

 the base of the fifth metatarsal bone; (3) the outer edge of the fourth tendon 



( 



Fig. 294.— Secoxd Layer of the Muscles of the Sole. 



Flexor brevis digitorum 



Origin of abductor minimi digiti _ _ 



"' ' ' '" Abductor hallucia 



Part of abductor minimi digiti 



Plexor brevis minimi digiti 



Abductor minimi digi 



Lumbrieales 



Tendon of flexor brevis 



digitorum 



Tendon of flexor brevis digitor 



Accessorius 



Flexor longus digitorum 



Flexor longus hallucis 

 Flexor brevis hallucis 



Adductor hallucis 

 Abductor hallucis 



\S-i^' 



of the extensor longus digitorum upon the l)ack of the first phalanx of the little 

 toe. 



Structure. — Tlie muscle, which is at first encased in the aponeuroses, from 

 which as well as from the bone it takes origin, converges from both sides upon a 

 tendon which is first visible on its under surface at the front of the calcaneum. A 

 small portion of its outer part is now inserted into the tubercle of the fifth meta- 

 tarsal bone, internal to the strong aponeurotic band which is also here attached. 

 From this point the tendon of insertion is free on its inner side, but receives fieshy 

 fibres still from the continuation of the aponeurotic liand just mentioned, until it 

 is inserted into the base of the first ))halanx. 



Nerve-supply. — P^rom the external i)lantar division of the posterior tibial 



