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Along with the soleus muscle, the gastrocnemius forms half of the calf muscle. Its function is plantar flexing the foot at the ankle joint and flexing the leg at the knee joint. The gastrocnemius is primarily involved in running, jumping and other "fast" movements of leg, and to a lesser degree in walking and standing.
Soleus muscles have more slow muscle fibers than many other muscles. In some animals, such as the guinea pig and cat, soleus consists of 100% slow muscle fibers. [6] [7] Human soleus fiber composition is variable, containing between 60% and 100% slow fibers. [8] The soleus is the most effective muscle for plantar flexion in a bent knee position.
The superficial portion (the gastrocnemius) gives off two heads attaching to the base of the femur directly above the knee. The deep (profundus) mass of muscle (the soleus) forms the remaining head which attaches to the superior posterior area of the tibia. The triceps surae is innervated by the tibial nerve, specifically, nerve roots L5–S2.
The Achilles tendon connects muscle to bone, like other tendons, and is located at the back of the lower leg. The Achilles tendon connects the gastrocnemius and soleus muscles to the calcaneal tuberosity on the calcaneus (heel bone). [10] The tendon begins near the middle of the calf, and receives muscle fibers on its inner surface ...
It is composed of a thin muscle belly and a long thin tendon. While not as thick as the achilles tendon, the plantaris tendon (which tends to be between 30–45 centimetres (12–18 in) in length) is the longest tendon in the human body. Not including the tendon, the plantaris muscle is approximately 5–10 centimetres (2.0–3.9 in) long and ...
The Achilles tendon is wider than normal, further suggesting inflammation. Achilles tendinitis is usually diagnosed from a medical history, and physical examination of the tendon. Projectional radiography shows calcification deposits within the tendon at its calcaneal insertion in approximately 60 percent of cases. [16]
The Achilles tendon is the strongest and thickest tendon in the body. [14] It connects the calf muscles to the heel bone of the foot. The calf muscles are the gastrocnemius, soleus and the heel bone is called the calcaneus. It is approximately 15 centimeters (5.9 inches) long and begins near the middle part of the calf.
Recent research has indicated that while the test is an accurate detector of achilles rupture, it is unable to distinguish between partial tear (tear of the gastrocnemius or soleal portion only) and a complete tear of both portions. [4] Complete tear of achilles tendon in ultrasound with Simmonds' test