Muscle | Origin | Insertion | Innervation | Action |
---|---|---|---|---|
Gastrocnemius | Superior-posterior aspect of Medial Femoral Condyle Lateral surface of Lateral Femoral Condyle |
Calcaneal tuberosity via Achilles' Tendon | Tibial n. S1 - S2 |
TCJ: PF Knee: Flexion |
Soleus | Posterior Fibula Posterior Tibia |
Calcaneal tuberosity via Achilles' Tendon | Tibial n. S1 - S2 |
TCJ: PF Lower leg: Stabilization |
Triceps Surae Muscle Group
- Gastrocnemius
- Soleus
- Since the gastrocnemius is a biarticular muscle, its ability to plantarflex is influenced by the knee position.
- When the knee is extended, the gastrocnemius is lengthened and is more efficient at plantarflexion.
- When the knee is flexed the gastrocnemius is shortened and becomes less efficient while plantarflexing.
- Conversely, the soleus is a monoarticular muscle, so its length-tension curve is only affected by the ankle’s position.
Stretch
Citation
For attribution, please cite this work as:
Yomogida N, Kerstein C. Triceps Surae Muscle
Group. https://yomokerst.com/The
Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Knee and Lower
Leg/Posterior compartment/triceps_surae_muscle_group.html