Twin calf muscle


The twin calf muscle, also known as the calf twin muscle, has a structure about 25 cm long, 10 cm wide and 2 cm thick. He is particularly stressed when running and jumping. In the calf muscles there are predominantly FT fibers, which are responsible for fast, vigorous movements. One of the decisive factors for muscular performance is the length of the heel bone. The longer, the cheaper the leverage and athletic jumping and running disciplines are thus favored.

The antagonist of this calf muscle is the anterior tibial muscle, which causes the tip of the foot to lift.

Also read our topic: Calf Pain

Figure twin calf muscles

Illustration of the gastrocnemius muscle: right and left lower leg from behind (A) and right lower leg from the outside (B)

Gastrocnemius muscle
Two-headed calf muscle - 1st + 2nd
(Twin calf muscle)

  1. External calf muscle -
    Gastrocnemius muscle,
    Caput laterale
  2. Internal calf muscle -
    Gastrocnemius muscle,
    Caput mediale
  3. Shin community -
    Corpus tibiae
  4. Heel bone - Calcaneus
  5. Calf community -
    Corpus fibulae
  6. Achilles tendon -
    Tendo calcaneus
  7. Thigh shaft -
    Corpus femoris
  8. External articular knot -
    Lateral condyle
  9. Inner articular knot -
    Medial condyle
  10. Kneecap - patella

You can find an overview of all Dr-Gumpert images at: medical illustrations

Approach, origin, innervation

Approach: via the Achilles tendon on the calcaneus tuberosity (tendo calcaneus Tuber calcanei)

Origin: above the femur glands (Epicondyle lateralis et medialis femoris)

Innervation: Tibial nerve, S1-2

How is the muscle trained / contracted?

The twin calf muscle is particularly stressed when jumping. Therefore, especially in basketball players, this muscle is well defined and very easily recognizable. In targeted strength training, it is trained by squats and leg presses under other muscles. A specific exercise for training this muscle is the calf lift.

How is the muscle stretched

In order to stretch the twin calf muscles in a targeted manner, the athlete stands in a step position. The hands press against resistance with a slight forward lean of the upper body. The back, straight leg is stretched, with the tip of the foot pointing forward and the heel resting completely on the floor.

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