Knee Muscle Chart

Rectus Femoris

O: AIIS
I: Tibial tuberosity via patellar tendon
A: Hip flexion and knee extension

Vastus lateralis

O: Linea aspera
I: Tibial tuberosity via patellar tendon
A: Knee extension

Vastus intermedius

O: Anterior femur
I: Tibial tuberosity via patellar tendon
A: Knee extension

Vastus Medialis

O: Linea aspera
I: Tibial tuberosity via patellar tendon
A: Knee extension

Semitendinosus

O: Ischial tuberosity
I: Anteromedial surface of the proximal tibia
A: Extend hip and flex knee

Semimembranousus

O: Ischial tuberosity
I: Posterior surface of medial condyle of tibia
A: Hip extension and knee flexion

BIceps femorus

O:-Long head: Ischial tuberosity
-Short head: Linea aspera
I: Fibular head
A:-Long head: Hip extension and knee flexion
-Short head: Knee flexion

Popliteus

O: Lateral condyle of femur
I: Posterior medial condyle of tibia
A: Initiates knee flexion

Gastrocnemius

O: Medial and lateral condyles of femur
I: Posterior calcaneus
A: Knee flexion and ankle plantar flexion