sartorius
O: ASIS
I: upper part of medial surface of shaft of tibia
A: Flexes, abducts, external rotation of femur; slight internal
rotation of leg at the knee joint
after flexion
N: femoral nerve
rectus femoris
O: AIIS
I: tibial tuberosity via patellar tendon
A: flexes thigh, extends leg
N: femoral nerve
vastus lateralis
O: intertrochanteric line
I: tibial tuberosity via patellar tendon
A: extends leg
N: femoral nerve
vastus medialis
O: intertrochanteric line
I: tibial tuberosity via patellar tendon
A: extends leg
N: femoral nerve
vastus intermedius
O: anterior and lateral 2/3 of femur
I: tibial tuberosity via patellar tendon
A: extends leg
N: femoral nerve
gracilis
O: pubic ramus
I: upper, medial shaft of tibia
A: adducts thigh
N: obturator nerve
pectineus
O: superior ramus of pubis
I: lesser trochanter
A: flexes thigh, assists in adduction when hip flexed
N: femoral nerve
adductor longus
O: anterior pubis
I: linea aspera
A: adducts thigh, assists with medial rotation
N: obturator nerve
adductor brevis
O: inferior ramus of pubis
I: linea aspera
A: adducts thigh
N: obturator nerve
adductor magnus
O: inferior ramus of pubis
I: linea aspera, adductor tubercle of femur
A: adducts and extends thigh
N: obturator nerve
biceps femoris
O: long head- ischial tuberosity
short head- linea aspera
I: head of fibula
A: flexes knee and
long head- extends thigh
N: long head- tibial nerve
short head- common peroneal nerve
semitendinosus
O: ischial tuberosity
I: medial, superior tibia
A: flexes knee, extends thigh
N: tibial nerve
semimembranosus
O: ischial tuberosity
I: posterior, superior tibia
A: flexes knee, extends thigh
N: tibial nerve