The soleus muscle is placed deeply with respect to the twins. It originates from the head and upper third of the posterior aspect of the fibula, from the line of the soleus muscle of the tibia and from the tendinous arch between the fibular head and tibia (tendinous arch of the soleus muscle) distal to the polytheus muscle.
Its imposing tendon joins that of the gastrocnemius muscle forming the calcaneal (or Achilles) tendon which is inserted into the calcaneal tuberosity, in the middle third of the posterior aspect of the calcaneus.
Unique of the muscles that form the triceps of the sura to be monoarticular with its action it flexes the ankle plantar and participates in the flexion of the knee. It develops its maximum power when, starting from the flexed ankle position and extended knee, it contracts to extend the foot. The soleus is particularly important in the disciplines of resistance (high percentage of red fibers) while the gastrocnemius is more a power muscle.
It is innervated by the tibial nerve (L4-S1).
| ORIGIN Head, dorsal face and lateral margin of the fibula; oblique line and arch of the soleus muscle on the tibia |  |
| INSERTION In the heel tendon (or Achilles) on the middle third of the back face of the calcaneus | |
| ACTION Extends the foot (plantar flexes) and contributes to flexion of the leg | |
| INNERVATION TIBIAL NERVE (L4-S1) |
| Upper limb | Lower limb | Trunk | Abdomen | Articles |
