Muscles Of The Posterior Compartment Of The Thigh

The muscles in the posterior compartment of the thigh are primarily extensors of the hip or flexors of the knee because of their posterior orientation. The tibial nerve (L4-S3) innervates the muscles in the posterior compartment of the thigh, with the exception of the short head of the biceps femoris muscles (common fibular nerve). Muscles in this compartment do not receive all the innervation levels from the tibial nerve; rather, they receive innervation from the spinal nerve level between L5 and S2 (Figure 36-2C).

Semitendinosus muscle. Attaches proximally to the ischial tuberosity and the medial surface of the proximal tibia (pes anserinus). The semitendinosus muscle extends and medially rotates the thigh at the hip joint. In addition, the muscle flexes and medially rotates the leg at the knee joint. The tibial division of the sciatic nerve (L5-S2) innervates this muscle.

Semimembranosus muscle. Attaches proximally to the ischial tuberosity and the medial tibial condyle. The semi-membranosus muscle flexes and medially rotates the leg at the knee joint and extends and medially rotates the thigh at the hip joint. The tibial division of the sciatic nerve (L5-S2) innervates this muscle.

Biceps femoris muscle. Consists of two heads (long and short heads). Proximally, the long head attaches on the ischial tuberosity, and the short head attaches to the lateral lip of the linea aspera. Distally, the muscle attaches to the head of the fibula. The biceps femoris muscle flexes and medially rotates the leg at the knee joint and extends and medially rotates the thigh at the hip joint. The tibial nerve (L5-S2) innervates the long head, and the short head is innervated by the common fibular nerve (L5-S2).

Hamstrings Muscles Posterior Thigh
Figure 36-2: A. Superficial view of muscles of the medial compartment of the thigh. B. Deep view of muscles of the medial compartment of the thigh. C. Muscles of the posterior compartment of the thigh (hamstrings).
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Responses

  • piero marchesi
    What are the three muscles of the posterior compartment of thigh?
    3 months ago

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