Iliopsoas (Psoas major & Iliacus) Action flexion at hip flexion at lumbar intervertebral joints (psoas major only)

Gluteus Maximus Largest Actions Extends and laterally rotates at hip joint

Gluteus Medius 2nd Largest Actions Abduction and medial rotation at hip joint

Gluteus Minimus Smallest Actions abducts and medially rotates SAME AS MEDIUS

Tensor Fasciae Latae (iliotibial or IT band) Action flexion and medial rotation at hip lateral support of knee

Piriformis Origin Insertion Action sacrum femur (greater Trochanter) lateral rotation and abduction at hip joint

Quadratus Femoris Action lateral rotation at the hip joint

Adductor Magnus Origin Insertion Action pubis & ischium femur (linea aspera) Action altogether: adduction at hip joint superior portion: flexion and medial rotation at hip inferior part: extension and lateral rotation at hip

Adductor Longus Origin Insertion Action pubis femur (linea aspera) adduction, flexion, and medial rotation at hip same for adductor brevis

Adductor Brevis Origin Insertion Action pubis femur (linea aspera) adduction, flexion, and medial rotation at hip same for adductor longus

Pectineus Origin Insertion Action Pubis Femur adducts, flexes, and medially rotates at hip

Gracilis Origin Insertion Action pubis tibia flexes at knee, adducts and medially rotates at hip

Rectus Femoris Origin Insertion Action anterior inferior iliac spine Insertion tibial tuberosity via patellar ligament Action extends at knee, flexes at hip part of quadriceps femoris muscle group of anterior thigh

Vastus Lateralis Origin Insertion Action femur Insertion tibial tuberosity via patellar ligament Action extension at knee joint part of quadriceps femoris muscle group of anterior thigh

Vastus Medialis Origin Insertion Action Femur Insertion tibial tuberosity via patellar ligament Action extension at knee joint part of quadriceps femoris muscle group of anterior thigh

Vastus Intermedius Origin Insertion Action femur Insertion tibial tuberosity via patellar ligament Action extension at knee joint part of quadriceps femoris muscle group of anterior thigh

Sartorius Origin Insertion Action Anterior superior iliac spine tibia flexion at knee flexion and lateral rotation at hip

Biceps Femoris Origins Insertion Action Long Head: ischial tuberosity Short Head: femur Insertion Long Head: tibia Short Head: head of fibula Action flexes knee, extends and laterally rotates hip Part of Hamstring Muscle group (posterior thigh)

Semimembranosus Origin Insertion Action ischial tuberosity Insertion medial tibia Action flexion at knee, extension and medial rotation at hip Part of Hamstring Muscle group (posterior thigh)

Semitendinosus Origin Insertion Action Ischial Tuberosity Insertion medial tibia Action flexion at knee, extension and medial rotation at hip Part of Hamstring Muscle group (posterior thigh)

Tibialis Anterior Action dorsiflexion (flexion at ankle) inversion of foot

Peroneals peroneus (fibularis) longus peroneus (fibularis) brevis Actions eversion of foot and plantar flexion (extension at ankle)

Gastrocnemius Origin Insertion Action femur calcaneus via achille’s tendon Action plantar flexion (extension at ankle), inversion of foot, flexion of knee

Soleus Origin Insertion Action fibula & tibia calcaneus via achille’s tendon Action plantar flexion (extension of ankle)

Popliteus Action medial rotation of tibia (or lateral rotation of femur) flexion at knee

Extensor Digitorum Longus Action flexion at joints of toes 2-5

Extensor Hallucis Longus Action Flexion at great toe