Semimembranosus (medial Hamstring) n Origin: Ischial tuberosity (ischum of pelvis) n Insertion: medial condyle of tibia n Action: flexes leg at knee and medially rotates; extends, adducts, and medially rotates thigh at hip
Semitendinosus
Semitendinosus n Origin: Ischial tuberosity with tendon of the long head of biceps femoris n Insertion: tibia just below the medial condyle n Action: flexes leg at knee and medially rotates; extends, adducts and medially rotates thigh at hip
Biceps femoris
Biceps femoris n Origin: LONG HEAD: ischial tuberosity SHORT HEAD: supracondylar line of femur n Insertion: lateral side of fibula, lateral condyle of tibia n Action: flexes and laterally rotates leg at knee; extends, adducts and laterally rotates thigh at hip
Gluteus maximus
Gluteus maximus n Origin: posterior gluteal line of illium, sacrum, and coccyx n Insertion: gluteal tuberosity of femur and iliotibial tract (IT band) n Action: extends thigh at hip forcefully; upper 2/3 of muscle is abductor and lower 1/3 is inactive as abductor or adductor in standing position
Bursitis of Knee
Knee Joint Ligaments
Gracilis
Gracilis n Origin: lower ½ of symphysis pupis and ramus of pupis n Insertion: medial surface of tibia just below condyle n Action: adducts and medially rotates thigh; flexes and medially rotates leg
Sartorius
Sartorius n Origin: anterior iliac spine and upper half of notch below n Insertion: medial surface of tibia just below condyle n Action: flexes, laterally rotates and abducts thigh as when crossing your legs