16 MR. E. J. SIDEBOTHAM ON THE [Jail. 20, 



Tibialis posticus. — xlrises from inner part of posterior surface of 

 shaft of fibula in its upper fifth, passes behind inner malleolus, and 

 is inserted into inner and under surfaces of astragalus. 



Flexoi- longits digitorum. — Arises from inner border of posterior 

 surface of tibula at its upper third and from interosseous membrane. 

 Tendon joins inner border of tendon of flexor longus pollicis. 



Flexor fongus pollicis. — Arises from whole of inner and posterior 

 surfaces of fibula. The muscle is easily separable into two parts, 

 the deep portion joining the tendon of the superficial in its lower 

 fifth. The tendon divides into five slips, one of which passes to 

 each of the toes. The tendon to the hallux comes off from the 

 superficial part, and some of its fibres are directly continuous with 

 those of the flexor longus digitorum. Four lumbricales are present, 

 arising from single tendons and passing to tibial side of corresponding 

 toe. The outer one is larger than the others. 



Accessorius — Arises from a ridge at outer border of lower surface 

 of OS calcis. It passes inwards and slightly forwards, and is chiefly 

 inserted into tendon of flexor longus pollicis. 



Tibialis (inticus. — A large muscle, arising from upper two fifths 

 of outer surface of shaft of tibia. It is inserted into inner side of 

 internal cuneiform. 



Extensor longus digitorum. — A small muscular belly, arising 

 from inner side of ridge on anterior border of head of fibula. It 

 divides into two tendons. Inner one again divides into three, which 

 are inserted by two slips into bases of first phalanges of index, 

 rnedius, and annularis. Outer tendon is similarly inserted into 

 minimus. Tendon to annularis is connected by vinculse to adjoining 

 tendons. 



Ex/ensor longus pollicis. — Arises from upper half of shaft of fibula 

 on its anterior aspect ; passes obliquely to inner side of foot, and is 

 inserted at base of first phalanx of great toe. 



Peroncus longus arises by two heads: — 1. From posterior part of 

 head of fibula and sesamoid bone. 2. From outer part of prominent 

 ridge on anterior border of fibula, and septum between it and 

 peroneus brevis. Peroneus quinti digiti lies between its two heads. 

 Its tendon passes behind external malleolus into sole of foot, and is 

 inserted into outer angle of metacarpal of great toe. 



Peroneus brevis. — Arises from anterior border of fibula just below 

 prominent ridge and septa between it and peroneus longus and 

 extensor longus digitorum. It is inserted into outer side of base of 

 metacarpal of minimus. 



Peroneus qvinti digiti. — Arises from external condyle of femur and 

 external lateral ligament. Its long tendon passes behind external 

 malleolus to be inserted into outer side of first phalanx of minimus. 



Peroneus quarti digiti. — Arises from upper third of anterior surface 

 of fibula with exception of a small interval at top. 



Peroneus tertii digiti.- — A very slender muscular belly, arising from 

 outer side of fibula just below outer head of peroneus longus. Of 

 the arrangement of these last two muscles I am not certain. The 

 former seemed in right foot to divide and to pass to outer sides of 



