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
Two-headed calf muscle - 1st + 2nd
(Twin calf muscle)
- External calf muscle -
- Internal calf muscle -
- Shin community -
- Heel bone - Calcaneus
- Calf community -
- Achilles tendon -
- Thigh shaft -
- External articular knot -
- Inner articular knot -
- 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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Who am I?
My name is dr. Nicolas Gumpert. I am a specialist in orthopedics and the founder of and work as an orthopedist at Lumedis.
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