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
- Knee curl machine.
- Hip extension using a resistance band.
Example stretches
- Sitting hamstring stretch.
- Standing hamstring stretch.
- Partner hamstring stretch.
Related injuries
- Hamstring strains.
- Hamstring tendinitis.
Related muscles
- Semitendinosus.
- Biceps femoris.
