Triceps surae muscle

Triceps surae

Posterior view of the human calf with the triceps surae. (Two heads of the gastrocnemius visible at first)
Origin distal femur (gastrocnemius), posterior tibia (soleus)
Insertion achilles tendon, calcaneus
Artery posterior tibial artery
Nerve tibial nerve
Actions plantarflexion
Latin musculus triceps surae
TA A04.7.02.043
FMA 51062

Anatomical terms of muscle

The triceps surae (/ˈtrsɛps ˈsjʊər/) (from Latin caput and sura. "three-headed [muscle] of the calf") is a pair of 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.


The two muscle layers that make up the triceps surae, namely the gastrocnemius and soleus.

The triceps surae is connected to the foot through the Achilles tendon, and has 3 heads deriving from the 2 major masses of muscle.

The triceps surae is innervated by the tibial nerve, specifically, nerve roots L5–S2.


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) and power jumping.

Clinical significance

Calf strain (torn calf muscle)

A torn calf muscle occurs when the calf muscle is pulled apart from the Achilles tendon. Severe pain is often felt by the victim and is often, but not always, accompanied by a "pop."

This injury happens during acceleration or changes in direction. The torn calf muscle may spasm, and contract forcefully. The toes may also point down. Bruises can show up in the leg, foot and ankle due to pooling of blood from internal bleeding. It may take some time for the bruises to occur, from hours to days depending upon where the tear occurred. The circumference of the leg will likely increase. This injury may take several months to heal.

Calf muscles are also very suspectable to Fasciculations and people with Benign Fasciculation syndrome often complain of twitching in either one or both calves.

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