22 MESSRS. F. E. BEDDARD AND F. TREVES ON THE’ [Jan. 15, 
(3) Arises from the shaft of the fibula behind and below the 
other peroneal muscles ; it passes down beneath the tendon of second 
peroneal and is inserted on to the cuboid bone. 
(4) The fourth peroneal is a small muscle arising from the lower 
part of the first peroueal; it is inserted into the tendon of the third 
peroneal. 
Extensor communis digitorum.—This muscle arises from the upper 
part of the tibia; it is a fleshy muscle and passes down through a 
well-marked annular ligament ; its tendon divides into three branches ; 
two very strong ones supply inner and outer toes; the tendon of 
middle toe is very slender. 
The anterior tibial arises by two muscular bands from the shaft 
of the tibia; it is inserted below into the base of the inner meta- 
tarsal bone and tarsus. 
Extensor brevis digitorum arises from astragalus, and is inserted 
mainly into the middle toe together with the /ongus, but forming 
much the larger part of the tendon; some fibres go to the inner toe, 
none to the outer. 
Flexor communis digitorum.—This is a large fleshy muscle and 
takes the place of the flewores longus, longus pollicis, and of the 
tibialis posticus in Man. It arises from the posterior surface of the 
tibia and of the fibula; the origin from the fibula extends as high 
wp as a ridge on its head ; it also arises from fascia over popliteal ; 
from the tibia it arises only from the outer side of the lower part of 
the shaft; the muscle becomes tendinous at the ankle and passes 
over a trochlear surface formed partly of cartilage and in connection, 
as it appeared, with the calcaneo-cuboid ligament; it communi- 
cates by a tendinous slip with the flevor brevis and then divides 
into three tendons, each of these passes under a sheath formed by 
the flexor brevis, and is inserted at the base of the last phalanx of 
rts digit. 
The Flexor brevis is entirely tendinous and is really nothing more 
than a continuation of the plantaris’ ; it divides into three tendons, 
each of which forms a sheath for the /ongus to go through, and from 
the inner wall of the sheath small tendons are continued forwards to 
the base of the second phalanx; the three sheaths seem to be joined 
at the side. 
The Lumbricales are four in number; three of these are in 
connection with Jongus and one seems to arise from the outer 
tendon of long and short flexors. 
There are Interossei muscles in each space and on both sides. 
The Gastrocnemius is a large muscle ; it arises from the femur by 
two heads ; it passes down and is attached to os calcis. 
The Plantaris is a slender strong muscle; it arises from the outer 
condyle of the femur; it passes down under gastrocnemius to os 
calcis, where it spreads out and passes over a smooth cartilaginous 
surface upon the bone and forms the flexor brevis digitorum. 
The Popliteus is a large muscle; it arises from the external 
condyle of femur ; it passes obliquely downwards and inwards to be 
1 
As in most other Mammals. 
