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 that 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 lifts the tip of the foot.

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. Femoral shaft -
    Corpus femoris
  8. External articular knot -
    Lateral condyle
  9. Inner joint gnar -
    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 bone (tendo calcaneus Tuber calcanei)

Origin: above the femur glands (Epicondylus 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 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 specifically stretch the twin calf muscles, the athlete stands in a step position. The hands press against resistance while leaning forward slightly. 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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