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2 Αυγ 2023 · Semimembranosus is a relatively large muscle that originates from a small facet on the rough superolateral surface of the ischial tuberosity. The tendon of semimembranosus appears at the level of the mid-thigh and continues caudally toward the point of insertion at the medial condyle of the tibia.
24 Οκτ 2022 · Attachments: Originates from the ischial tuberosity (more superiorly than the origin of the semitendinosus and biceps femoris). Attaches to the medial tibial condyle. Actions: Flexion of the leg at the knee joint. Extension of thigh at the hip. Medially rotates the thigh at the hip joint and the leg at the knee joint.
The semimembranosus muscle (/ ˌsɛmiˌmɛmbrəˈnoʊsəs /) is the most medial of the three hamstring muscles in the thigh. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus muscle. It extends the hip joint and flexes the knee joint.
The semimembranosus acts synergistically with the popliteus muscle through the fibrous extension towards this muscle. The distal semimembranosus complex actively pulls the posterior horn of the medial meniscus, protecting it from being crushed between the medial femoral condyle and the posterior medial tibial plateau during knee flexion.
Actions & Testing. The semimembranosus muscle is involved in multiple actions: - flexes the leg at the knee joint; - medially rotates the leg at the knee joint while this joint is held in a semiflexed position; - extends the thigh at the hip joint.
22 Μαρ 2024 · Function. The semimembranosus muscle, as part of the hamstring group, has several important functions related to movement and stabilization of the lower limb: Hip Extension: The semimembranosus aids in extending the hip joint, which involves moving the thigh backward.
The semimembranosus muscle acts on both the hip and the knee joint in the same way as the other two muscles of the posterior compartment of the thigh. It's also an antagonist of the quadriceps femoris. Let's start by looking at the action of the semimembranosus at the hip joint. The contraction of the muscle acts to extend the thigh which is ...
