(Hamstrings) Semimembranosus

knee-model-lateral-view-labeledMuscle Origin

Ischial tuberosity to medial condyle of tibia.

Upper outer quadrant of the posterior surface of the ischial tuberosity, deep to the conjoined tendon of the semitendinosus and the long head of the biceps femoris.

Insertion

Medial condyle of tibia.

The posterior aspect of the medial condyle of tibia, below the joint line, sending fibers into the fascia over popliteal ligament.

Action

Flexes lower leg at knee.

Extension of the thigh at the hip, flexion of the leg at the knee, internal rotation of the knee when knee is flexed.

Innervation – Nerve control

Tibial part of sciatic nerve.

The semimembranosus is innervated by the tibial part of the sciatic nerve. The sciatic nerve consists of the anterior divisions of ventral nerve roots from L4 through S3. Wiki

Artery

Profunda femoris and gluteal arteries.

Antagonist muscles

Quadriceps muscle and Tensor fasciae latae.

The quadriceps femoris, also known as the quadriceps, quadriceps extensor, or quads, is a large muscle group that includes the four prevailing muscles on the front of the thigh.

Pictures of muscles

 

Trigger Point Referrals

 

Stretching description

 

Exercises

 

Injuries

 

Treatment

 

Additional Resources
Sports lab
Wiki
American Academy of Manual Medicine
Innerbody

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