Lower Extremity OIAI

Origin of Gluteus Maximus

Origin: External surface of ilium behind the posterior gluteal line

insertion of Gluteus Maximus

gluteal tuberosity and IT band

action of Gluteus Maximus

hip extension, hip external rotation

origin of gluteus medius

ilium between anterior and posterior gluteal lines

insertion of gluteus medius

Greater trochanter

Action of gluteus medius

Hip abduction

Innervation of gluteus medius

Superior gluteal nerve

Innervation of gluteus maximus

Inferior gluteal nerve

Origin of gluteus minimus

Ilium between inferior and anterior gluteal lines

Insertion of gluteus minimus

Greater trochanter

Action of gluteus minimus

Hip internal rotation

Innervation of gluteus minimus

Superior gluteal nerve

origin of tensor fasciae latae

Lateral aspect of ASIS

Insertion of tensor fasciae latae

IT band

Action of tensor fasciae latae

Hip abduction when hip is flexed

Origin of Piriformis

anterior surface of sacrum

insertion of piriformis

greater trochanter

action of piriformis

Hip external rotation and hip abduction

Innervation of piriformis

nerve to piriformis

innervation of tensor fasciae latae

superior gluteal nerve

origin of gemellus superior

ischial spine

insertion of gemellus superior

Greater trochanter via tendon of obturator internus

Action of gemellus superior

Hip external rotation

Innervation of gemellus superior

Nerve to obturator internus

Origin of obturator internus

Internal surface of obturator foramen and membrane

insertion of obturator internus

greater trochanter

action of obturator internus

hip external rotation

innervation of obturator internus

nerve to obturator internus

origin of gemellus inferior

ischial tuberosity

insertion of gemellus inferior

greater trochanter via tendon of obturator internus

action of gemellus inferior

hip external rotation

innervation of gemellus inferior

nerve to quadratus femoris

origin of obturator externus

1. Pubis and ischium near obturator foramen
2. External surface of obturator membrane

insertion of obturator externus

trochanteric fossa

Action of obturator externus

Hip external rotation

Innervation of obturator externus

Obturator

Origin of quadratus femoris

ischial tuberosity

Insertion of quadratus femoris

quadrate tubercle

Action of quadratus femoris

Hip external rotation

Innervation of quadratus femoris

Nerve to quadratus femoris

Origin of Semitendinosus

ischial tuberosity

Insertion of Semitendinosus

1. Anteromedial aspect of superior tibia
2. Contributes to pes anserinus

Action of Semitendinosus

Hip extension
Knee flexion
Knee internal rotation

Innervation of Semitendinosus

Tibial

Origin of semimembranosus

Ischial tuberosity

Insertion of semimembranosus

Posterior medial aspect of the medial tibial condyle

Action of semimembranosus

Hip extension
Knee flexion
Knee internal rotation (open chain)

Innervation of semimembranosus

Tibial

Origin of biceps femoris

Long head: ischial tuberosity and sacrotuberous ligament
Short head: Lateral lip of linea aspera

Insertion of biceps femoris

Head of fibula

Action of biceps femoris

Knee flexion
Hip extension (long head)
Knee external rotation (open chain)

Innervation of biceps femoris

Long head: tibial
Short head: Common fibular

Origin of iliacus

Iliac fossa

Insertion of iliacus

Lesser trochanter

Action of iliacus

Hip flexion
Hip external rotation

Innervation of iliacus

femoral nerve

Origin of psoas major

Bodies and transverse processes of T12-L5

Insertion of psoas major

Lesser trochanter

Action of psoas major

Hip flexion
Hip external rotation

Innervation of psoas major

ventral rami of L1-L3

Origin of sartorius

ASIS

Insertion of Sartorius

1. Anteromedial aspect of superior tibia
2. Contributes to pes anserine

Action of sartorius

1. Hip flexion, abduction and external rotation
2. Knee flexion and internal rotation

Innervation of sartorius

femoral

Origin of rectus femoris

Anterior head: AIIS
Posterior head: Rim of acetabulum

Insertion of rectus femoris

Tibial tuberosity

Action of rectus femoris

Knee extension
Hip flexion

Innervation of rectus femoris

femoral

origin of vastus lateralis

1. Greater trochanter
2. Lateral lip of linea aspera

Insertion of vastus lateralis

Tibial tuberosity

Action of vastus lateralis

Knee extension

Innervation of vastus lateralis

Femoral

Origin of vastus medialis

1. Intertrochanteric line
2. Medial lip of linea aspera

Insertion of vastus medialis

tibial tuberosity

Action of vastus medialis

Knee extension

Innervation of vastus medialis

femoral

origin of vastus intermedius

Upper anterolateral femoral shaft

insertion of vastus intermedius

tibial tuberosity

Action of vastus intermedius

Knee extension

Innervation of vastus intermedius

femoral

Origin of gracilis

Inferior pubic ramus

Insertion of gracilis

1. Anteromedial aspect of superior tibia
2. Contributes to pes anserine

Action of gracilis

Hip adduction

Innervation of gracilis

obturator

Origin of adductor longus

Body of pubis

Insertion of adductor longus

Medial lip of linea aspera mid femur

Action of adductor longus

Hip adduction

Innervation of adductor longus

Obturator

Origin of adductor brevis

Inferior pubic ramus

Insertion of adductor brevis

Superior 1/3 of medial lip of linea aspera

Action of adductor brevis

Hip adduction

Innervation of adductor brevis

Obturator

Origin of adductor magnus

Anterior fibers: inferior pubic ramus
Posterior fibers: ischial tuberosity
Oblique fibers: ischial ramus

Insertion of adductor magnus

1. Medial lip of linea aspera
2. Adductor tubercle

Action of adductor magnus

Hip adduction

Innervation of adductor magnus

Anterior fibers: Obturator
Posterior fibers: Tibial

Origin of pectineus

Pectineal line of pubis

Insertion of pectineus

Pectineal line of femur

Action of pectineus

Hip adduction

Innervation of pectineus

Femoral and accessory obturator