Calf muscle

Triceps surae
Posterior view of the human calf with the triceps surae. (Two heads of the gastrocnemius visible at first)
Details
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
Dorlands /Elsevier	triceps surae muscle
TA	A04.7.02.043
FMA	51062
Anatomical terms of muscle []

The triceps surae (/ˈtraɪsɛps ˈsjʊəriː/) (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 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.

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.