Name

# Semitendinosus

Pronunciation

(sem-e-ten-di-NO-sus)

Origin/Proximal Attachment

Ischial tuberosity

Insertion/Distal Attachment

Medial aspect of tibial shaft

contributes to pes anserine

Action/Relevance

Extends the hip

Flexes the knee

Internally rotates the tibia

Innervation

Tibial nerve of sciatic bundle (L5, S1, 2)

Notes

Shares common attachment with the long head of the biceps tendon

Belly is fusiform that ends at about 50% of the total length and runs on the surface of semimemb.

Tendon curves around the medial tibial condyle, over the medial collateral; lig. and inserts behind sartorius and distal to gracilis.