j THE MUSCLES IN THE SOLE OF THE FOOT. 363 
The adductor transversus hallucis arises from (1) the capsules of the outer 
four metatarso-phalangeal articulations and (2) the transverse metatarsal ligament. 
Directed transversely inwards, under cover of the flexor tendons and lumbricales, 
the muscle is inserted, along with the adductor obliquus (from which it is 
separated by an angular interval), into the outer side of the base of the first 
phalanx of the great toe. 
The flexor brevis minimi digiti (m. flexor brevis digiti quinti) arises 
from (1) the sheath of the peroneus longus, and (2) the base of the fifth 
metatarsal bone. Partially concealed by the adductor minimi digiti, the muscle 
passes along the fifth metatarsal bone, to be inserted, in common with that muscle, 
into the outer side of the base of the first phalanx of the little toe. 
The interossei muscles of the foot resemble those of the hand except in one 
respect. In the hand the line of action of the muscles is the middle line of the 
middle finger. In the foot the second toe is the digit round which the muscles are 
grouped, and theirattach- 
ments and actions differ 
accordingly. 
There are four dorsal 
and three plantar 
muscles, which occupy 
together the four inter- 
osseous spaces, and pro- 
ject into the hollow of 
the foot. 
The four dorsal mus- 
cles, one in each inter- 
osseous space, arise by 
two heads each from the 
shafts of the metatarsal 
bones. Each gives rise 
to a tendon, which, after 
passing above the trans- 
verse metatarsal liga- 
ment, 1s inserted on the Fic. 268.—INTEROSSEOUS MUSCLES OF THE Foor. 
dorsum of the foot into A, Dorsal muscles of the left foot ; B, Plantar muscles of the right foot. 
the side of the first 
phalanx, the metatarso-phalangeal capsule, and the dorsal expansion of the extensor 
tendon. The jirst and second muscles are inserted into the second toe on the tibial 
and fibular sides respectively. The third and fourth muscles are inserted into the 
third and fourth toes on their fibular sides. 
The three plantar muscles occupy the three outer interosseous spaces. Hach 
arises by a single head from the tibial side of the third, fourth, and fifth metatarsal 
bones respectively. Each ends in a tendon which passes beneath the transverse 
metatarsal ligament, and is inserted, in the same manner as the dorsal muscles, into 
the third, fourth, and fifth toes on their tibial side. 
NeERVE-SUPPLY OF THE MuSCLES OF THE LEG AND Foot. 
Muscles. | Nerves. | Origin. 
Tibialis anticus 
Extensor proprius Hallacis 
Extensor longus digitorum 
Peroneus fers 
Peroneus longus ; : : 
Peroneus brevi is" . : aif 
Extensor brevis digitoru Won . | anterior tibial 
Plantaris - z F P 
Popliteus ro i 3 f F | Ee 
Gastrocnemius A , . 
Soleus 
-anterior tibial 
a2 SS 
musculo-cutaneous . | 
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