Anatomy A,o,i,in

Front 1

Rectus Femoris

Back 1

A: hip flexor, knee extensor
O: anterior inferior iliac spine (AIIS)
I: tibial tuberosity (via the patella and patellar tendon)
N: femoral L2,L3,L4

Front 2

Vastus Medialis

Back 2

A: extends the knee
O: medial lip of linea aspera
I: tibial tuberosity (via the patella and patellar ligament)
Inn: femoral L2,L3,L4

Front 3

Vastus Lateralis

Back 3

A: extend knee
O: lateral lip of linea aspera, gluteal tuberosity, greater trochanter
I: tibial tuberosity via the patella and patellar ligament
Inn: femoral L2, L3, L4

Front 4

Vastus Intermedius

Back 4

A: extend knee
O: anterior and lateral shaft of the femur
I: tibial tuberosity (via the patella and patellar ligament)
Inn: femoral L2,L3,L4

Front 5

Biceps Femoris

Back 5

A: flex knee, laterally rotate flexed knee, posteriorly tilt pelvis, extend hip (long head), lateral rotation of hip (long head)
O: ischial tuberosity (long head), lateral lip of linea aspera (short head)
I: head of fibula
Inn: sciatic-tibial branch-L5,S1,S2,S3 (long head)
sciatic-peroneal branch-L5,S1,S2 (short head)