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A hamstring (/ ˈ h æ m s t r ɪ ŋ /) is any one of the three posterior thigh muscles in human anatomy between the hip and the knee: from medial to lateral, the semimembranosus, semitendinosus and biceps femoris.
The semimembranosus muscle (/ ˌ s ɛ m i ˌ m ɛ m b r ə ˈ n oʊ s ə s /) 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 hamstrings are innervated by the sciatic nerve, specifically by a main branch of it: the tibial nerve. (The short head of the biceps femoris is innervated by the common fibular nerve). The sciatic nerve runs along the longitudinal axis of the compartment, giving the cited terminal branches close to the superior angle of the popliteal fossa.
Pes anserinus inserts onto the anteromedial (front and inside) surface of the proximal tibia. The muscles are the sartorius , gracilis and semitendinosus sometimes referred to as the guy ropes . The name "goose foot" arises from the three-pronged manner in which the conjoined tendon inserts onto the tibia.
hamstring: 2 1 vastus medialis: Lower limb, Thigh, Anterior compartment anteromedial surface of femur: patella and tibial tuberosity via patellar tendon: femoral artery: femoral nerve: extends knee: hamstring: 2 1 biceps femoris: Lower limb, Thigh, Posterior compartment/hamstring ischial tuberosity (long head), linea aspera of femur (short head ...
The biceps femoris (/ ˈ b aɪ s ɛ p s ˈ f ɛ m ər ɪ s /) is a muscle of the thigh located to the posterior, or back. As its name implies, it consists of two heads; the long head is considered part of the hamstring muscle group, while the short head is sometimes excluded from this characterization, as it only causes knee flexion (but not hip extension) [1] and is activated by a separate ...
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A muscle that fixes or holds a bone so that the agonist can carry out the intended movement is said to have a neutralizing action. A good famous example of this are the hamstrings; the semitendinosus and semimembranosus muscles perform knee flexion and knee internal rotation whereas the biceps femoris carries out knee flexion and knee external ...