658 



HUMAN ANATOMY. 



extend obliquely downward to a tendon which passes behind the outer malleolus and 



then runs forward in a groove on the 



Fig. 625. 



Head of fibula 

 Tubercle of tibia 



Extensor longus 

 digitorum, cut 



Tibialis anticus 



Peroneus longus 



Abductor minimi digiti 



i C V in iii 



Superficial dissection of right leg, antero-lateral aspect, 

 showing peroneal muscles. 



calcaheum, in which it is held by- 

 fibrous bands (retinacula mm. pero- 

 naeorum). On the cuboid it again 

 changes its direction, passing upon 

 the plantar surface of the foot in a 

 groove upon that bone which is cov- 

 ered in by the long plantar liga- 

 ment, and then, running obliquely 

 across the foot, it is i7iserted into the 

 internal cuneiform and the base of 

 the first metatarsal bone. In front 

 of the tuberosity of the cuboid the 

 tendon usually contains a sesamoid 

 cartilage. 



Nerve-Supply. — By the mus- 

 culo-cutaneous nerve from the fourth 

 and fifth lumbar and first sacral nerves. 



Action. — To extend the foot and 

 evert the sole. 



Relations. — The peroneus lon- 

 gus occupies the lateral surface of the 

 leg (Fig. 617). It is in contact pos- 

 teriorly with the soleus and internally 

 with the extensor longus digitorum, 

 being separated from these muscles by 

 the intermuscular septa. The musculo- 

 cutaneous nerve passes through the 

 substance of the upper part of the mus- 

 cle and is continued downward between 

 the peroneus longus and the extensor 

 longus digitorum. In the foot the ten- 

 don of the peroneus longus is deeply 

 placed, resting directly upon the plan- 

 tar surfaces of the cuboid, the external 

 cuneiform, and the bases of the second 

 and third metatarsal bones. 



Peroneus Brevis (Fig. 624). 



Attachments. — The peroneus 

 brevis lies beneath the peroneus lon- 

 gus and arises from the lower portion 

 of the lateral surface of the fibula 

 and from the intermuscular septa. Its 

 fibres join a tendon which 

 Tendons of ex- passcs behind the external 

 ;}Skorun^cut malkolus and then dis- 

 tally, along with the ten- 

 don of the peroneus lon- 

 gus, beneath the fibrous 

 bands or retinacula to be 

 inserted into the tuberos- 

 ity of the fifth metatarsal 

 bone. 



Nerve-Supply. — By 

 the musculo - cutaneous 



inimi digili 



nerve from the fourth and fifth lumbar and first sacral nerves. 



