1870.] MYOLOGY OF PLATYDACTYLUS JAPONICUS. 425 
the base of the first phalanx of the hallux, and of the second and third 
digits; the fourth is inserted by two heads, one of which goes to 
the head of the metatarsal bone, and the other to the side of the first 
phalanx of the fourth digit. 
Interossei plantares.—Four in number ; three fill up the spaces 
between the metatarsals of the first three digits, the fibres going 
obliquely from the fibular to the tibial side; the other arises from 
the cuboid and goes to the metatarsal bone of the fourth digit with- 
out entirely filling up the space. 
Tibialis anticus is visible both on the flexor and extensor sides of 
the leg; it arises from the surface of the tibia for nearly its whole 
length, and is inserted into the metatarsal bone of the hallux. 
Peroneus longus arises from distal half of the fibula on the flexor 
side, and is inserted fleshy into the cuboid close to its articulation 
with the fifth digit; from this it gives off a broad tendinous expan- 
sion, which is inserted into the cuneiform bone, covering the tarsus 
beneath the flexor tendons ; from its extreme point on the tibial side 
arises a small muscle, which is inserted into the head of the meta- 
tarsal bone of the hallux. 
Peroneus brevis arises from the distal two-thirds of the outer 
surface of the fibula, and is inserted into the cuboid bone of the 
tarsus; it also sends a tendon to the back of the foot, which is in- 
serted into the extremity of the metatarsal bone of the fourth digit. 
Extensor longus digitorum arises from the anterior aspect of the 
peroneal condyle of the femur by a flat tendon; it forms a thick 
belly in the leg, partially divisible into two, and ends by two flat 
tendons, which are inserted into the metatarsal bones of the second 
and third digits. If this muscle were situated in the forearm it 
might be called ext. carp. rad. long. et brev. 
Extensor ossis metatarsi hallucis arises from the distal end of 
fibula, and crossing the tarsus is inserted into the whole length of 
the tibial side of the metatarsal bone of the hallux. 
Extensor brevis digitorum arises from the peroneal side of the bone 
of the tarsus corresponding with the united astragalus and calca- 
neum. It consists of four radiating fasciculi: the first crosses the 
foot and ends in a tendon, which is inserted into the penultimate 
phalanx of the hallux; the second is inserted in like manner into 
the penultimate phalanx of the third digit, the third into the third 
phalanx of the fourth digit ; the fourth fasciculus is intimately united 
to the dorsal interosseus of the fifth digit, its tendon being inserted 
into the second phalanx of that digit. 
Interossei dorsales.—Two muscles arise together from the dorsal 
surface of the metatarsal bone of the hallux: one goes to the tibial 
side of the hallux, being inserted into the whole length of its meta- 
tarsal bone and phalanges; the other goes to the tibial side of the 
second digit. The interosseus of the fibular side of the hallux arises 
from the tibial side of the metatarsal bone of the second digit. Two 
muscles arise together from the dorsal side of the second metatarsal 
bone: one forms an extensor for that digit, and is inserted by a long 
tendon into its penultimate phalanx ; the other forms an interosseus 
