Origin Action Insertion Total

Iliacus Origin

Iliac Fossa, sacral crest.

Iliacus Insertion

Lesser trochanter

Iliacus Action

Thigh and trunk flexion

Psoas Major Origin

T12 and lumbar vertebrae

Psoas Major insertion

Lesser trochanter

Sartorius Origin

Anterior superior iliac spine

Sartorius Insertion

Medial proximal tibia

Sartorius action

flexes, abducts, and laterally rotates knee

Adductor Magnus Origin

Ischial and pubic rami, ischial tuberosity

Adductor Magnus Insertion

Linea aspera and adductor tubercle

Adductor magnus actions

Adducts medially, rotates, anterior flexes thigh, posterior extends thigh

Adductor longus Origin

Pubis, near pubic symphysis

Adductor longus insertion

Linea aspera

Adductor longus action

adducts, flexes, and medially rotates thigh

Adductor brevis Origin

Body and inferior pubic ramus

Adductor brevis insertion

linea aspera

Adductor brevis action

Adducts, flexes, and medially rotates thigh

Pectineus Origin

Pubis

Pectineus Insertion

Lesser trochanter to linea aspera

Pectineus action

adducts, flexes, and medially rotates

Gracilis origin

Inferior ramus and body of pubis

Gracilis insertion

medial tibial inferior to medial condyle

Gracilis action

Adducts thigh, flexes, and medially rotates leg

Rectus femoris origin

Anterior inferior iliac spine

Rectus femoris insertion

patella and tibial tuberosity via patellar tendon

Rectus femoris action

Extends leg and flexes thigh

Vastus lateralis origin

Greater trochanter, intertrochanteric line, linea aspera

Vastus latralis insertion

Patellar and tibial tuberosity via patellar tendon

vastus lateralis action

extends and stabilizes the leg

Vastus medialis origin

linea aspera and intertrochanteric line

Vastus medialis insertion

patella and tibila tuberosity via patellar tendon

vastus medialis action

extends leg

Vastus intermedius origin

proximal femur shaft

vastus intermedius insertion

patella and tibial tuberosity via patellar tendon

Vastus intermedius action

extends leg

Tensor fasciea latea origin

iliac crest and anterior superior iliac spine

tensor fasciae latae insertion

iliotibial tract

tensor fasciae latae action

steadies leg and trunk on thigh by making iliotibial tract taut

Iliotibial tract origin

Iliac crest

Iliotibial tract insertion

Knee

Iliotibial tract action

Extend, abduct, and laterally rotate the hip, contributes to lateral knee stabilization

Gluteus maximus origin

dorsal ilium, sacrum, and coccyx

gluteus maximus insertion

gluteal tuberosity and iliotibial tract

gluteus maximus action

extends thigh

Gluteus medius origin

lateral surface of ilium

gluteus medius insertion

greater trochanter

gluteus medius action

abducts and medially rotates thigh

biceps femoris long head origin

ischial tuberosity

biceps femoris long head insertion

tendon inserting into head of fibula and lateral condyle of tibia

biceps femoris short head origin

linea aspera and distal femur

biceps femoris short head insertion

tendon inserting into head of fibula and lateral condyle

biceps femoris action

extends thigh and flexes leg

semitendinosus origin

ischial tuberosity

semitendinosus insertion

medial aspect of proximal tibial shaft

semitendinosus action

extends thigh and flexes leg

semimembranosus origin

ischial tuberosity

semimembranosus insertion

medial tibial tuberosity

semimembranosus action

extends thigh and flexes leg

tibialis anterior origin

lateral condyle and proximal two thirds of tibial shaft

tibialis anterior insertion

tarsals and metatarsals

tibialis anterior action

dorsiflexion

extensor digitorum longus origin

lateral condyle of tibia and proximal three fourths of fibula

extensor digitorum longus insertion

2nd through 5th phalanges

extensor digitorum longus action

extends the toes

fibularis longus origin

head and proximal portion of fibula

fibularis longus insertion

tendon to 1st metatarsal

fibularis longus action

plantar flexes and everts foot

fibularis brevis origin

distal fibula shaft

fibularis brevis insertion

tendon to 5th metatarsal

fibularis brevis action

plantar flexes and everts foot

gastrocnemius origin

medial and lateral condyles of femur

gastrocnemius insertion

calcaneus via tendon

gastrocnemius action

plantar flexes foot

soleus origin

superior tibia, fibula, and interosseous membrane

soleus insertion

calcaneus via tendon

soleus action

plantar flexes foot

plantaris origin

posterior femur above lateral condyle

plantaris insertion

calcaneus

plantaris action

flex leg and plantar flex foot