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The knee flexors include the set of hamstrings, gracilis, sartorius, gastrocnemius, plantaris, and popliteus. Most of these knee flexors also internally or externally rotate the knee. The hamstring muscles are the primary knee flexors. They play a key role in everyday movements, eg running, walking. Bending of the knee is known as flexion.
The prime flexors of the knee joint are biceps femoris, semitendinosus and semimembranosus, whereas popliteus initiates flexion of the “locked knee” and gracilis and sartorius assist as weak flexors. The primary extensor of the knee joint is quadriceps femoris, assisted by the tensor fasciae latae. Quadriceps femoris of four muscle bellies ...
The quadriceps femoris muscle group (rectus femoris, vastus lateralis, vastus medius, and vastus intermedius) crosses the knee via the patella and acts to extend the leg. The hamstring group muscles (semitendinosus, semimembranosus, and biceps femoris) flex the knee and extend the hip.
Knee flexor muscles refer to a group of muscles including hamstrings, gracilis, sartorius, gastrocnemius, plantaris, and popliteus, which are responsible for flexing the knee joint. These muscles also contribute to internal or external rotation of the knee.
They are the main knee flexor muscles and their primary role is to bend the knee. Each of the three hamstrings muscles, semimembranosus , semitendinosus and biceps femoris , originate from the bottom of the pelvis, travel down the back of the thigh and attach to the back of the knee.
The majority of the muscles located in the anterior compartment of the thigh are knee extensors (i.e. quadriceps femoris), except for sartorius which is a knee flexor. Muscle Origin
Knee flexors include the semimembranosus, biceps femoris, gracilis, gastrocnemius, and popliteus. The gracilus is a thigh adductor that flexes and medially rotates the knee. The popliteus unlocks and weekly flexes the knee. Divisions of the sciatic nerve or tibial nerve innervate knee flexors.