Origin/Insertion of Muscles - Hamstrings - Semimembranosus and Semitendinosus

Semimembranosus
Origin: Ischial Tuberosity of os coxa
Insertion: Posterior medial condyle of tibia
Action: Flexes leg at knee, medially rotates leg at knee when knee is flexed; also extends thigh at hip



Ischial Tuberosity

Posterior Medial Condyle (Tibia)

Semitendinosus
Origin: Ischial Tuberosity of os coxa
Insertion: Proximal tibia, medial to the tibial tuberosity
Action: Flexes leg at knee, medially rotates leg at knee when knee is flexed

Proximal Tibia (Posterior view)