ve Oe ee ee Cee 
F j : ? i a 
364 THE MUSCULAR SYSTEM. , by 
NERVE-SUPPLY OF THE MuSCLES OF THE LEG AND Foor—continued. 
Muscles. Nerves. | Origin. 
: é i= 
Soleus : ; : || | I GH ISS 1h. 
Flexor longus digitorum : | . +) Ibs SSE Il 
at ety OER Oe aS posterior tibial . 
Tibialis posticus 5 eee tibial | rom Soule 
Flexor longus hallucis ait E15. S222! 
Abductor hallucis . g | 
Wlexor “AVIS 1O7] " | . 1 
Phe xor brevis digitorum - (internal plantar Th, 4251S 
Flexor brevis hallucis. . ; : | 
First Lumbricalis . : P awl 
Second, third, and fourth lumbri- | | 
cales | 
Flexor aceessorius . ; 2 | 
Adduetores hallucis : Lexternal plantar wt | ne Lge 
Interossei ; : : || 
Flexor brevis minimi digiti Sets 
Abductor minimi digiti : mal 
ACTION OF THE MUSCLES OF THE LEG AND Foot. 
The muscles of the leg and foot act chiefly in the movements of the ankle-joint (assisted by 
movements of the inter-tarsal joints) ; of the metatarso-phalangeal joints (assisted by movements 
of the tarso-metatarsal and inter-metatarsal joints); and of the inter-phalangeal joints of the 
several toes. , 
I. Tibio-Fibular Articulations.—The upper tibio-fibular articulation is only capable of 
slight gliding movement, occasioned by the action of the biceps and popliteus and the muscles 
arising from the fibula. 
II. Movements at the Ankle-Joint.—The movements at the ankle-joint are movements of 
flexion and extension of the foot on the leg, along with inversion and eversion (only during 
extension). These movements are produced at the ankle, aided by movements in the inter-tarsal 
joints, and are occasioned by the following muscles :— 
a. Flexion. Extension. |b. Inversion. — Eversion. 
Tibialis anticus Gastrocnemius Tibialis anticus | Peroneus tertius 
| Extensor communis digitorum | Plantaris Peroneus longus 
Extensor proprius hallucis Soleus _'Tibialis posticus | Peroneus brevis 
Peroneus tertius _'Tibialis posticus | ; 
Peroneus longus | 
Peroneus brevis | 
Flexor longus digitorum 
| | Flexor longus hallucis 
III. Movements of the Toes—A. At the Metatarso-Phalangeal Joints (assisted by move- — 
ments at the tarso-metatarsal and inter-metatarsal joints)—These movements are flexion and 
extension, abduction and adduction (in a line corresponding to the axis of the second toe). 
t 
a. Flexion. Extension. 
Flexor longus digitorum Extensor longus digitorum 
Accessorius 
Lumbricales Extensor brevis digitorum 
Flexor longus hallucis 
Flexor brevis hallucis Extensor proprius hallucis 
Flexor brevis digitorum 
Flexor brevis minimi digiti 
Interossei 
6. Abduction. Adduction. 
(From and to the middle line of the second toe). 
Abducetor hallucis | Adductores hallucis 
Dorsal interossei | Plantar interossei 
Abductor minimi digiti | 
