The prime mover for knee flexion is biceps femoris, semimembranosus, and semitendinosus. The prime mover for knee extension is the Quadriceps â?? vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris
The muscle group that is the primary mover when a flexion of the knee is performed is the hamstring. When doing a knee extension the quadriceps are the muscle group used.
Bicep Femoris
Rectus femoris+ anterior thigh; quadriceps+ extension of leg at knee Vastus lateralis+ lateral anterior thigh; quadriceps+ extension of leg at knee Vastus Medialis+ medial anterior thigh; quadriceps+ extension of leg at knee Vastus intermedius+ deep anterior thigh; quadriceps+ extension of leg at knee Sartorius (*) parallel strap-like muscle that crosses thigh flexion of knee forward Biceps femoris* posterior thigh; hamstring* flexion of leg at knee Semitendinosus* posterior thigh; hamstring* flexion of leg at knee Semimembranosus* posterior thigh; hamstring* flexion of leg at knee
rectus femoris
All muscles that are agonists or synergists in knee extention, are antagonists in knee flexion.
Function of the sartorius is flexion of the hip and knee joints. It is also called as 'Tailor's muscle'.
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The three muscles that aid on knee flexion are the semitendiosus, semimembranosus, and the biceps femoris. None of these muscles are considered the prime mover because they all cross two joints. Therefore all three of the muscles are considered to be synergist.
The rectus femoris THe regular Muscle Action is hip flexion with knee extension, as in kicking a ball or doing a straight leg raise The reverse muscle action is still hip flexion with knee extension, but as in doing sit-ups while lying supine with knes straight ahead
The popliteus
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plantar flexion and knee flexion
to extend of straighten the knee