332
UNIT TWO
Gastrocnemius m.
Fibularis longus m.
Deep fibular n.
Superficial fibular n.
Anterior tibial a.
Extensor digitorum longus m.
Extensor hallucis longus m.
Fibula
Soleus m.
Tibia
Great saphenous v.
Tibialis posterior m.
Flexor digitorum longus m.
Small saphenous v.
Posterior tibial a.
Flexor hallucis longus m.
Tibial n.
Tibialis anterior m.
Plane of
section
Anterior
the foot, and because it crosses the knee joint, it also fl exes
the knee.
The
flexor digitorum longus
(flek
sor dij
ı
˘-to
rum
long
gus) extends from the posterior surface of the tibia to
the foot. Its tendon passes along the plantar surface of the
foot. There the tendon divides into four parts that attach
to the terminal bones of the four lateral toes. This muscle
assists in plantar fl
exion of the foot, fl exion of the four lat-
eral toes, and inversion of the foot (see F
g. 9.43).
The
soleus
(so
le-us) is a thick, flat muscle located
beneath the gastrocnemius, and together these two muscles
form the calf of the leg. The soleus arises from the tibia and
F bula, and it extends to the heel by way of the calcaneal ten-
don. It acts with the gastrocnemius to cause plantar fl exion
of the foot (see F
gs. 9.42 and 9.43).
The
plantaris
(plan-ta
ris) connects the femur to the
heel, where it inserts with the gastrocnemius and soleus via
the calcaneal tendon. When the plantaris contracts it fl exes
FIGURE 9.44
A cross section of the leg (superior view). (
a.
stands for artery,
m.
stands for muscle,
n.
stands for nerve, and
v
. stands for vein.)
TABLE
9.14
|
Muscles That Move the Foot
Muscle
Origin
Insertion
Action
Nerve Supply
Tibialis anterior
Lateral condyle and lateral surface of
tibia
Tarsal bone (cuneiform) and F
rst
metatarsal
Dorsi±
exion and inversion of foot
Deep F
bular n.
²ibularis tertius
Anterior surface of F
bula
Dorsal surface of F
fth metatarsal
Dorsi±
exion and eversion of foot
Deep F
bular n.
Extensor digitorum
longus
Lateral condyle of tibia and anterior
surface of F
bula
Dorsal surfaces of second and
third phalanges of four lateral toes
Dorsi±
exion and eversion of foot,
extends toes
Deep F
bular n.
Extensor hallucis longus
Anterior surface of F
bula
Distal phalanx of the great toe
Extends great toe, dorsi±
exion and
inversion of foot
Deep F
bular n.
Gastrocnemius
Lateral and medial condyles of femur
Posterior surface of calcaneus
Plantar ±
exion of foot, ±
exes knee
Tibial n.
Soleus
Head and shaft of F
bula and posterior
surface of tibia
Posterior surface of calcaneus
Plantar ±
exion of foot
Tibial n.
Plantaris
²emur
Calcaneus
Plantar ±
exion of foot, ±
exes knee
Tibial n.
²lexor digitorum longus
Posterior surface of tibia
Distal phalanges of four lateral
toes
Plantar ±
exion and inversion of
foot, ±
exes four lateral toes
Tibial n.
Tibialis posterior
Lateral condyle and posterior surface
of tibia and posterior surface of F
bula
Tarsal and metatarsal bones
Plantar ±
exion and inversion of
foot
Tibial n.
²ibularis longus
Lateral condyle of tibia and head and
shaft of F
bula
Tarsal and metatarsal bones
Plantar ±
exion and eversion of
foot, also supports arch
SuperF
cial F
bular n.
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