Lower Extremity Muscles O/I/A & Innervation

Gluteus maximus: Origin

posterior ilium, iliac crest, PSIS, coccyx

Gluteus maximus: Insertion

Gluteal tuberosity of femur

Gluteus maximus: Action

hip extension, hip abduction, stabilizes hip

Gluteus maximus: Innervation

inferior gluteal nerve

Gluteus medius: Origin

lateral ilium

Gluteus medius: Insertion

greater trochanter of femur

Gluteus medius: Action

hip abduction, medial rotation

Gluteus medius: Innervation

superior gluteal nerve

Gluteus minimus: Origin

lateral ilium

Gluteus minimus: Insertion

greater trochanter of femur

Gluteus minimus: Action

hip abduction, medial rotation

Gluteus minimus: Innervation

superior gluteal nerve

Piriformis: Origin

sacrum, ilium, sacroiliac joint

Piriformis: Insertion

greater trochanter of femur

Piriformis: Action

lateral rotation of hip, abduction when the hip is flexed

Piriformis: Innevation

spinal nerves L5-S2

Tensor fascia latae: Origin

ASIS

Tensor fascia latae: Insertion

lateral condyle of tibia via iliotibial tract

Tensor fascia latae: Action

knee extension, lateral rotation of tibia, abduction of hip, medial rotation of femur

Tensor fascia latae: Innervation

superior gluteal nerve

Rectus femoris: Origin

AIIS

Rectus femoris: Insertion

 patella, tibial tuberosity

Rectus femoris: Action

knee extension, hip flexion

Rectus femoris: Innervation

femoral nerve

Vastus lateralis: Origin

greater trochanter of femur

Vastus lateralis: Insertion

patella, tibial tuberosity

Vastus lateralis: Action

knee extension

Vastus lateralis: Innervation

femoral nerve

Vastus medialis: Origin

intertrochanteric line of femur

Vastus medialis: Insertion

patella, tibial tuberosity

Vastus medialis: Action

knee extension

Vastus medialis: Innervation

femoral nerve

Vastus intermedius: Origin

anterior femur

Vastus intermedius: Insertion

patella, tibial tuberosity

Vastus intermedius: Action

knee extension

Vastus intermedius: Innervation

femoral nerve

Sartorius: Origin

ASIS

Sartorius: Insertion

proximal, medial tibia

Sartorius: Action

 knee and hip flexion, abduction of hip, lateral rotation of hip

Sartorius: Innervation

femoral nerve

Gracilis: Origin

pubis and ischial ramus

Gracilis: Insertion

medial surface of tibia just below condyle

Gracilis: Action

 aids in hip flexion, medially rotates tibia

Gracilis: Innervation

obturator nerve

Adductor magnus: Origin

pubis and ischium

Adductor magnus: Insertion

linea aspera, gluteal tuberosity, medial supracondylar line

Adductor magnus: Action

 adducts and medially rotates hip

Adductor magnus: Innervation

obturator and tibial nerve

Adductor longus: Origin

pubis

Adductor longus: Insertion

linea aspera of femur

Adductor longus: Action

adduction and medial rotation of the hip

Adductor longus: Innervation

obturator nerve

Adductor brevis: Origin

pubis

Adductor brevis: Insertion

linea aspera and spiral line of femur

Adductor brevis: Action

adducts the hip

Adductor brevis: Innervation

obturator nerve

Semimembranosus: Origin

ischial tuberosity

Semimembranosus: Insertion

medial condyle of the tibia

Semimembranosus: Action

knee flexion, medial rotation of the knee (when flexed), medial rotation of the hip (when extended)

Semimembranosus: Innervation

tibial nerve

Semitendinosus: Origin

ischial tuberosity

Semitendinosus: Insertion

medial condyle of the tibia

Semitendinosus: Action

knee flexion, medial rotation of the knee when flexed, medial rotation of the hip when extended

Semitendinosus: Innervation

tibial nerve

Biceps femoris (Long Head): Origin

 ischial tuberosity

Biceps femoris (Long Head): Insertion

head of fibula

Biceps femoris (Long Head): Action

knee flexion, hip extension, lateral rotation of the femur when the hip is extended

Biceps femoris (Long Head): Innervation

tibial and common fibular nerve

Biceps femoris (Short Head): Origin

linea aspera and lateral supracondylar line

Biceps femoris (Short Head): Insertion

head of fibula

Biceps femoris (Short Head): Action

knee flexion, hip extension, lateral rotation of the femur when the hip is extended

Biceps femoris (Short Head): Innervation

tibial and common fibular nerve

Extensor digitorum longus: Origin

lateral condyle of the tibia and shaft of tibia

Extensor digitorum longus: Insertion

middle and distal phalanges of II-V

Extensor digitorum longus: Action

toe extension, dorsiflexion, tenses plantar aponeurosis

Extensor digitorum longus: Innervation

deep fibular nerve

Extensor hallucis longus: Origin

anterior surface of mid fibula, interosseous membrane

Extensor hallucis longus: Insertion

distal phalanx I

Extensor hallucis longus: Action

extends big toe, dorsiflexion

Extensor hallucis longus: Innervation

deep fibular nerve

Anterior tibialis: Origin

lateral condyle and proximal tibia

Anterior tibialis: Insertion

medial cuneiform, metatarsal I

Anterior tibialis: Action

dorsiflexion and inversion of foot

Anterior tibialis: Innervation

deep fibular nerve

Flexor digitorum brevis: Origin

Flexor digitorum brevis: Insertion

Flexor digitorum brevis: Action

Flexor digitorum brevis: Innervation

Extensor digitorum brevis: Origin

Extensor digitorum brevis: Insertion

Extensor digitorum brevis: Action

Extensor digitorum brevis: Innervation

Fibularis longus: Origin

head and lateral surface of fibula

Fibularis longus: Insertion

medial cuneiform, metatarsal I

Fibularis longus: Action

 eversion and plantar flexion of ankle

Fibularis longus: Innervation

superficial fibular nerve

Fibularis brevis: Origin

lateral and distal fibula

Fibularis brevis: Insertion

base of metatarsal V

Fibularis brevis: Action

eversion

Fibularis brevis: Innervation

superficial fibular nerve