Triceps surae muscle
The triceps surae consists of two muscles located at the calf – the two-headed gastrocnemius and the soleus. These muscles both insert into the calcaneus, the bone of the heel of the human foot, and form the major part of the muscle of the posterior leg, commonly known as the calf muscle.
| Triceps surae | |
|---|---|
 Posterior view of the triceps surae. | |
Dissection video (1 min 40 s) | |
| Details | |
| Pronunciation | /ˈtraɪsɛps ˈsjʊəri/ |
| Origin | distal femur (gastrocnemius), posterior tibia (soleus) |
| Insertion | achilles tendon, calcaneus |
| Artery | posterior tibial artery |
| Nerve | tibial nerve |
| Actions | plantarflexion |
| Identifiers | |
| Latin | musculus triceps surae |
| TA98 | A04.7.02.043 |
| TA2 | 2656 |
| FMA | 51062 |
| Anatomical terms of muscle | |
Structure
The triceps surae is connected to the foot through the Achilles tendon, and has 3 heads deriving from the 2 major masses of muscle.[1]
- The superficial portion (the gastrocnemius) gives off 2 heads attaching to the base of the femur directly above the knee.
- The deep (profundus) mass of muscle (the soleus) forms the remaining head which attaches to the superior posterior area of the tibia.
The triceps surae is innervated by the tibial nerve, specifically, nerve roots L5–S2.
Function
Contraction of the triceps surae induce plantar flexion (sagittal plane) and stabilization of the ankle complex in the transverse plane. Functional activities include primarily movement in the sagittal plane, stabilization during locomotion (walking, running), restraining the body from falling and power jumping. By controlling the disequilibrium torque, the triceps surae can affect force through the exchange of potential into kinetic energy.[2]
Clinical significance
Calf strain (torn calf muscle)
A calf strain refers to damage to a muscle or its attaching tendons.[3][4] A premature return before recovery is achieved will result in a prolonged recovery or incomplete return to baseline prior to injury.[1] Stretches such as alternating calf raises can improve flexibility as well as mobilize legs before running.[4]
Calf muscles are a common place for fasciculations.
Additional images
Animation. Gastrocnemius and Soleus are shown in different colors.
Illustration of the gastrocnemius.
Illustration of soleus.
Nerves, arteries and veins surround the gastrocnemius and soleus.
Cross section of the lower leg, with triceps surae at back (soleus and gastrocnemius)
Nerves and blood-vessels overlying the triceps surae
Photograph of the gastrocnemius-soleus junction.
Etymology and pronunciation
The term is pronounced /ˈtraɪsɛps ˈsjʊəri/. It is from Latin caput and sura meaning "three-headed [muscle] of the calf".
References
- Dixon JB (June 2009). "Gastrocnemius vs. soleus strain: how to differentiate and deal with calf muscle injuries". Current Reviews in Musculoskeletal Medicine. 2 (2): 74–7. doi:10.1007/s12178-009-9045-8. PMC 2697334. PMID 19468870.
- Honeine JL, Schieppati M, Gagey O, Do MC (2013-01-16). "The functional role of the triceps surae muscle during human locomotion". PLOS ONE. 8 (1): e52943. doi:10.1371/journal.pone.0052943. PMC 3547017. PMID 23341916.
- "Calf Muscle Tear". physioworks.com.au. Retrieved 2020-02-09.
- Minnor M (2018-05-03). "7 Pre- and Post-Workout Stretches for Runners – Aaptiv". Aaptiv. Retrieved 2018-06-11.
