Muscles of the lower body

PSOAS Major

PSOAS Major origin and insertion

O: T12-L5

I: lesser trochanter of femur

PSOAS Major action

hip flexion

iliacus

iliacus origin and insertion

O: iliac fossa

I: lesser trochanter of femur

iliopsoas

sartorius

longest muscle in the body

Sartorius origin and insertion

O: ASIS

I: tibial tuberosity

sartorius action

hip- flexion, lateral rotation

knee- flexion, medial rotation

Tensor fasciae latae

Tensor fasciae latae origin and insertion

O: ASIS

I: iliotibial tract to lateral condyle

Tensor fasciae latae action

hip- flexion, abduction, medial rotation

-stabilizes femur/tibia when standing

gracilis

gracilis origin and insertion

O: pubis

I: tibia

gracilis action

hip-adduction

knee-flexion

pectineus

pectineus origin and insertion

O: pubic crest

I: pectineal line (femur)

Adductor longus

Adductor longus origin and insertion

O: pubis

I: linea aspera

Adductor longus action

hip: flexion, adduction, lateral flexion

Adductor brevis

adductor brevis origin and insertion

O: pubis

I: pectineal line, linea aspera

adductor brevis action

hip- flexion, adduction, lateral rotation

adductor magnus

adductor magnus origin and insertion

O: pubis and ischium, ishial tuberosity

I: linea aspera, adductor tubercle

adductor magnus action

hip- adduction, flexion, extension

Quadriceps

a muscle group consisting of four muscles that is located along the front of the thigh

rectus femoris

rectus femoris origin and insertion

O: AIIS

I: tibial tuberosity via patellar tendon

vastus intermedius

vastus intermedius origin and insertion

O: femur

I: tibial via patella/patellar ligament)

vastus intermedius action

knee extension

vastus lateralis

vastus lateralis origin and insertion

O: greater trochanter

I: tibial tuberosity (via patella/ patellar ligament)

vastus medialis

vastus medialis origin and insertion

O: linea aspera (femur)

I: tibial tuberosity (via patella/ patellar ligament)

vastus medialis action

knee extension

gluteus maximus

gluteus maximus origin and insertion

O: ilium, sacrum and coccyx

I: greater trochanter, IT tract (gluteal tuberosity)

gluteus maximus action

hip-extenstion, abduction, lateral rotation

gluteus minimus

gluteus minimus origin and insertion

O: ilium

I:greater trochanter of femur

gluteus minimus action

hip abduction and medial rotation

gluteus medius

gluteus medius origin and insertion

O: ilium,

I:greater trochanter of femur

gluteus medius action

hip abduction, medial rotation

Gemellus Superior, Inferior

Gemellus Superior, Inferior origin and insertion

O: Ischium

Ischial spine (s), Ischial tuberosity (I)

I: greater trochanter

Gemellus Superior, Inferior action

Hip-abduction and lateral roatation

obturator (externus,internus)

obturator (externus,internus) origin and insertion

O: inferior margin of obturator foramen

I: greater trochanter

obturator (externus,internus) action

Hip-lateral rotation

Piriformis

piriformis origin and insertion

O: ilium and sacrum

I: greater trochanter

piriformis action

hip-abduction and lateral rotation

Semitendinosus

Semitendinosus origin and insertion

O: ischial tuberosity

I: tibia

semitendinosus action

hip-extension

knee-flexion, medial rotation

biceps femoris

biceps femoris origin and insertion

O:

long head-ischial tuberosity

Short head-femur

I: head of fibula

biceps femoris action

hip-extension

knee-flexion, lateral rotation

Semimembranosus

Semimembranosus origin and insertion

O: ischial tuberosity

I: medial condyle of tibia (tibia)

semimembranosus action

hip extension, knee flexion, medial rotation