ANA 407 Lecture 18: ana407 lecture18
8 Jun 2016
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The hamstrings are actually a group of three large muscles, i. e. , semitendinosus, semimembranosus and long head of biceps femoris. a. n. ). b. c. All three muscles attach at the ischial tuberosity, (the short head of biceps femoris attaches to the femur). All three are innervated by the tibial division of the sciatic n. (the short head of biceps is innervated by the common fibular. Because the short head of biceps neither attaches at the ischial tuberosity nor is innervated by the tibial division of the sciatic n. , it is not a true hamstring muscle. The hamstrings extend the hip and flex the knee, so maximal shortening is achieved when the hip is extended and the knee is flexed. Maximal muscle forces diminish when such shortening occurs at both joints this is simultaneous. 1) medial rotation of the leg - produced by semitendinosus and semimembranosus.
