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The knee itself is bony cap known as the patella with tendons and ligaments as connectors without any muscles in it. However the Knee is aided by several muscles that run through it and act as stabilizers. These include the quadriceps, hamstrings, and the muscles of the calf.
These muscles work in groups to flex, extend and stabilize the knee joint. The simplest way to explain this is the muscles cover the knee cap running across it as a type of protective covering and help hold it in place. These motions of the knee allow the body to perform such important movements as walking, running, kicking, and jumping. We will dive into a bit more detail warning big words enclosed.
The anterior surface of the thigh contains the four muscles of the quadriceps femoris group (vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris). These large muscles originate in the ilium and femur and insert on the tibia.
The hamstring muscle group extends across the posterior surface of the thigh from the ischium of the pelvis to the tibia of the lower leg. Three individual muscles form the hamstrings group: biceps femoris, semitendinosus, and semimembranosus. The hamstrings work together to flex the leg at the knee.
In the calf region of the leg, the gastrocnemius muscle extends from the distal end of the femur through the calcaneal (Achilles) tendon to the calcaneus of the heel. The gastrocnemius forms the posterior muscular wall of the knee and acts as a flexor of the knee and plantar flexor of the foot.
Other muscles that assist with the movements of the knee include the tensor fasciae latae, popliteus and the articularis genus muscles. The tensor fasciae latae contracts the iliotibial band of fibrous connective tissue that helps to stabilize the femur, tibia, and thigh muscles. Flexion of the knee requires some slight rotation of the tibia, which is provided by the contraction of the popliteus muscle. The tiny articularis genus muscle elevates the suprapatellar bursa and capsule of the knee joint to prevent pinching of this soft tissue during extension of the leg at the knee.
This sums up how the knee muscles connect and what they do. I hope this has been helpful for you.
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