PROFESSOR OWEN ON THE AYE-AYE. 67 
outside, about halfway down the leg, but continues fleshy on the inside to near the 
insertion into the calcaneum. A small ‘ plantaris ’ fascicle sends its tendon by the side 
of the os calcis to the strong fascia covering the sole. 
The flexor digitorum longus pedis (Pls. XXIV. & XXV. figs. 1 & 2, ») arises from the 
back part of the head of the fibula and the interosseous space. It forms a flattened 
tendon behind the lower fourth of the tibia, which glides through a channel behind the 
inner malleolus, expands beneath the tarsus, gives origin to the short flexors (Pl. XXIV. 
fig. 1, 9), sends off a tendon (Pl. XXV. fig. 2, m), which is joined by a tendon (ib. n) 
from the flexor hallucis, to go to the second digit (#); then proceeds a short way, 
receives a second smaller tendon (2b. e) from the flewor hallucis, and finally divides into 
the flexor tendons of the three outer toes. The first of the short flexor muscles 
(Pl. XXIV. fig. 1, 36) sends a long and slender tendon to the first phalanx of the fifth toe ; 
the second (ib. 2%), to that of the fourth toe ; whilst the third (¢b. 36") is inserted into the 
large and long flexor tendon continued from the muscle itself. 
The flexor longus hallucis (Pl. XXIV. fig. 1, & Pl. XXV. fig. 2, 21) arises from the back 
part and inner ridge of the tibia, and from the interosseous space, halfway towards the 
lower end of the bone. The fleshy fibres are continued on the inner surface to the 
malleolar ligament ; the fleshy fibres on the outer side of the muscle, much higher up. 
The tendon glides through the groove behind the inner malleolus, sends off a small tendon 
(e) to join the division of the general fleror moving the three outer digits, and then 
divides into the flexor tendon of the hallux (4) and a tendon (n) joining that part of the 
general flexor tendon from which the tendon of the second digit proceeds. Thus, the 
major part of this muscle expends itself upon the flexion of the ordinary toes. These 
junctions between the flerores digitorum and hallucis combine the two muscles in a common 
action of grasping ; and the strength of the muscle, sending the long tendon to the hallux, 
gives it the requisite power of rotating the foot, through that member, in a convenient 
position for grasping. 
The tibialis anticus (Pl. XXV. figs. 1 & 3,2) arises from the upper half of the 
fore and outer surface of the tibia, becomes tendinous towards the lower third of the 
bone, glides through a pulley of the ligamentum transversum (z), and is inserted into 
the entocuneiforme. 
The peroneus longus (Pl. XXV. figs. 1 & 3, 25) arises from the head and upper 
two-thirds of the outer part of the fibula and contiguous part of the interosseous fascia, 
becomes tendinous towards the lower fourth of the leg, passes, with the tendon of the 
peroneus brevis, in the same sheath behind the outer malleolus, diverges to the cuboid, 
winds round the outer part of that bone in a groove, and, crossing the bases of the three 
middle metatarsals, is implanted into the base of that of the hallux. 
The peroneus brevis (Pl. XXV. fig. 3, 2) lies beneath the peroneus longus (ib. 25), 
arises from the lower two-thirds of the fibula, and from the aponeurotic septum between 
it and the extensor digitorum (s7); its tendon passes through the same sheath, behind 
K2 
