The origin of the hamstring muscles is on the ischial tuberosity; where are thei
ID: 212803 • Letter: T
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The origin of the hamstring muscles is on the ischial tuberosity; where are their insertions?
The origin of the hamstring muscles is on the ischial tuberosity; where are their insertions?
The biceps femoris and semitendinosus both have insertions on the linea aspera of the femur, while the semimembranosus inserts on the linea aspera and also on the tubercle of the femur. The biceps femoris inserts on the anterior superior iliac spine, and both the semimembranosus and the semitendinosus have insertions on the lateral condyle of the femur. The biceps femoris inserts on the head of the fibula and lateral condyle of the tibia, the semimembranosus inserts on the posterior surface of the medial condyle of the tibia, and the semitendinosus inserts on the medial surface of the tibia. The biceps, semimembranosus, and the semitendinosus all have insertions on the tibial tuberosity on the medial surface of the tibia.Explanation / Answer
The hamstrings consist of three muscles: Biceps Femoris muscle Semitendinosus muscle, and Semimembranosus muscle.
The biceps femoris muscle has two heads: short and long. The shorter head joins the long head on its deep surface when it descends in the thigh. Union of the two heads unite is followed by the gradual narrowing of the biceps femoris muscle to a tendon. This tendon attaches to the head of the fibula, the fibular collateral ligament, and the lateral tibial condyle. Long head is innervated by tibial part of sciatic nerve (L5 S2 S1). Short head is innervated by peroneal part of the sciatic nerve (L5; S1, S2).
The semimembranosus (SM) muscle originates from the lateral aspect of the ischial tuberosity. It passes down the posteromedial aspect of the thigh. Insertion is from the upper lateral part of upper quadrilateral area of ischial tuberosity. The semimembranosus muscle inserts into the horizontal groove on the posterior aspect of the medial condyle of the tibia. It is innervated by tibial part of sciatic nerve (L5 S1 and S2).
The semitendinosus originates from the medial part of upper quadrilateral area of the ischial tuberosity. This muscle inserts in the upper part of the medial surface of the tibia. It is innervated by tibial part of sciatic nerve (L5 S1 and S2).
Right option is: The biceps femoris inserts on the head of the fibula and lateral condyle of the tibia, the semimembranosus inserts on the posterior surface of the medial condyle of the tibia, and the semitendinosus inserts on the medial surface of the tibia.
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