Semimembranosus

Semimembranosus is the most medial of the three hamstring muscles. Chronically tight hamstrings are often a contributary factor to lower back pain and knee pain.

Origin

  • Ischial tuberosity.  

Insertion

  •   Posterior part of the medial condyle of the tibia.

Actions

  • Hip extension.  
  • Knee flexion.
  • Internal rotation of the hip when the knee is flexed.  

Innervation

  • Tibial part of the sciatic nerve.  

Daily uses

  • Bending the knee to step over something.  

Example strengthening exercises

Example stretches

Related injuries

Related muscles