Origin: proximal ⅔ of femur. Insertion: superior border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.

Origin: intertrochanteric line of femur; with tendon of adductors. Insertion: medial border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.

Origin: upper intertrochanteric line of femur; with tendon of gluteus maximus. Insertion: lateral border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.

Origin: iliac spine and brim of acetabulum of pelvis. Insertion: upper border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee and flexes thigh at hip.

Origin: outer surface of ilium. Insertion: greater trochanter of femur (head). Action: abducts femur at hip and rotates medially; major lateral hip stabilizer.

Origin: front of pubis between crest and symphysis. Insertion: middle ⅓ of femur. Action: adducts thigh at hip; assists in thigh flexion and medial hip rotation.

Origin: ischial tuberosity (ischium of pelvis). Insertion: medial condyle of tibia. Action: flexes leg at knee and medially rotates; extends, adducts, and medially rotates thigh at hip.

Origin: Long Head: ischial tuberosity. Short Head: supracondylar line of femur. Insertion: lateral side of fibula; lateral condyle of tibia. Action: flexes and laterally rotates leg at knee; extends, adducts and laterally rotates thigh at hip.

Origin: ischial tuberosity with tendon of the long head of biceps femoris. Insertion: tibia just below the medial condyle. Action: flexes leg at knee and medially rotates; extends, adducts and medially rotates thigh at hip.

O: posterior gluteal line of ilium, sacrum, and coccyx. I: gluteal tuberosity of femur and iliotibial tract (IT band). A: extends thigh at hip forcefully; upper ⅔ of muscle is abductor and lower ⅓ is inactive as abductor or adductor in standing.

Origin: lower ½ of symphysis of pubis and ramus of pubis. Insertion: medial surface of tibia just below condyle. Action: adducts and medially rotates thigh; flexes and medially rotates leg.

Origin: anterior iliac spine and upper half of notch below. Insertion: medial surface of tibia just below condyle. Action: flexes; laterally rotates and abducts thigh as when you are crossing your legs.

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Stack #4635970

Question	Answer
Vastus Intermedius	Origin: proximal ⅔ of femur. Insertion: superior border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.
Vastus Medialis	Origin: intertrochanteric line of femur; with tendon of adductors. Insertion: medial border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.
Vastus Lateralis	Origin: upper intertrochanteric line of femur; with tendon of gluteus maximus. Insertion: lateral border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee.
Rectus Femoris	Origin: iliac spine and brim of acetabulum of pelvis. Insertion: upper border of patella and tibial tuberosity by patellar ligament. Action: extends leg at knee and flexes thigh at hip.
Gluteus Medius	Origin: outer surface of ilium. Insertion: greater trochanter of femur (head). Action: abducts femur at hip and rotates medially; major lateral hip stabilizer.
Adductor Longus	Origin: front of pubis between crest and symphysis. Insertion: middle ⅓ of femur. Action: adducts thigh at hip; assists in thigh flexion and medial hip rotation.
Semimembranosus	Origin: ischial tuberosity (ischium of pelvis). Insertion: medial condyle of tibia. Action: flexes leg at knee and medially rotates; extends, adducts, and medially rotates thigh at hip.
Biceps Femoris	Origin: Long Head: ischial tuberosity. Short Head: supracondylar line of femur. Insertion: lateral side of fibula; lateral condyle of tibia. Action: flexes and laterally rotates leg at knee; extends, adducts and laterally rotates thigh at hip.
Semitendinosus	Origin: ischial tuberosity with tendon of the long head of biceps femoris. Insertion: tibia just below the medial condyle. Action: flexes leg at knee and medially rotates; extends, adducts and medially rotates thigh at hip.
Gluteus Maximus	O: posterior gluteal line of ilium, sacrum, and coccyx. I: gluteal tuberosity of femur and iliotibial tract (IT band). A: extends thigh at hip forcefully; upper ⅔ of muscle is abductor and lower ⅓ is inactive as abductor or adductor in standing.
Gracilis	Origin: lower ½ of symphysis of pubis and ramus of pubis. Insertion: medial surface of tibia just below condyle. Action: adducts and medially rotates thigh; flexes and medially rotates leg.
Sartorius	Origin: anterior iliac spine and upper half of notch below. Insertion: medial surface of tibia just below condyle. Action: flexes; laterally rotates and abducts thigh as when you are crossing your legs.

Created by: journey9

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