O/I/A/In.: Muscles of lower extremity Flashcards
Psoas Major
O: Transverse processes/bodies of lumbar vertebrae
I: lesser trochanter of femur
A: Flexion + lateral rotation of thigh at hip, and flexion of trunk on hip
In: lumbar spinal n. L2-L3
Psoas Minor
O: T12-L1
I: Iliopectineal line or fused w/ psoas maj.
A: Flexion of pelvis on abdomen
In: Lumbar plexus
Iliacus
O: Iliac fossa + sacrum
I: Tendon of psoas maj. (lesser troch)
A: Flexion + lateral rotation of thigh at hip
In: Femoral n.
Gluteus maximus
O: Iliac crest + post. gluteal line + sacrum + coccyx
I: IT of TFL + Gluteal tuberosity of femur
A: Extension + lateral rotation of thigh
In: inf. gluteal n.
Gluteus medius
O: Btwn ant. and post. gluteal lines
I: Greater trochanter of femur
A: Abduction + medial rotation of thigh
In: sup. gluteal n.
Gluteus minimus
O: btwn ant. and inf. gluteal lines
I: greater trochanter
A: abduction + medial rotation of thigh
In: sup. gluteal n.
Tensor Fascia Latae
O: ASIS + iliac crest
I: IT which attaches to lateral tibia
A: Flexion + abduction of thigh at hip
In: sup. gluteal n.
Piriformis
O: Ant. surface of sacrum
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Sacral plexus
Superior Gemellus
O: ischial spine
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus
Obturator Internus
O: inner surface of obturator foramen + pubis + ischium
I: greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus
Inferior gemellus
O: Ischial tuberosity
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus
Quadratus femoris
O: ischial tuberosity
I: quadrate tubercle of femur
A: lateral rotation of thigh
In: Lumbosacral plexus
Obturator externus
O: outer surface of obturator foramen + membrane
I: trochanteric fossa of femur
A: lateral rotation + abduction of thigh
In: Obturator n.
Sartorius
O: ASIS
I: proximal, medial shaft of tibia
A: Flexion + abduction + lateral rotation of thigh at hip; flexion of knee
In: Femoral n.
Rectus Femoris
O: AIIS
I: Patella (quadriceps tendon) then tibial tuberosity (patellar lig)
A: Flexion at hip; Extension at knee
In: Femoral n.
Vastus Lateralis
O: Greater trochanter + lateral margin of linea aspera of femur
I: Patella + tib tub
A: Knee extension
In: Femoral n.
Vastus Medialis
O: medial margin of linear aspera
I: Patella + tib tub
A: Extension of knee
In: Femoral n.
Vastus Intermedius
O: Ant. + lat. shaft of femur
I: Patella + tib tub
A: Extension of knee
In: Femoral n.
Pectineus
O: Superior ramus of pubis
I: Pectineal line of femur
A: Flexion + adduction at hip
In: Femoral n.
Adductor Brevis
O: Inferior ramus of pubis
I: Superior half of linea aspera
A: adduction + flexion + rotation at hip
In: Obturator n.
Adductor Longus
O: Pubic crest + symphysis
I: Linea aspera
A: Adduction + flexion + rotation at hip
In: Obturator n.
Adductor Magnus
O: Inferior ramus of pubis + ischium to ischial tuberosity
I: Linear aspera and adductor tubercle of femur
A: adduction + rotation + flexion (ant. fibers) + extension (post. fibers) at hip
In: Obturator n. + sciatic n.
Adductor Minimus
O: Inferior ramus of pubis
I: Medial lip of linea aspera
A: adduction + lateral rotation at hip
In: Obturator n.
Gracilis
O: Body + inferior ramus of pubis
I: Proximal, medial shaft of tibia
A: adduction at hip; flexion + medial rotation at knee
In: Obturator n.
Biceps femoris
O:
- Long head: Ischial tuberosity
- Short head: linea aspera of femur
I: Head of fibula + lateral condyle of tibia
A: Extension at hip (long head only) + flexion at knee
In: Sciatic n. (tibial + common fibular n.)
Semitendinosus
O: Ischial tuberosity
I: Proximal, medial shaft of tibia
A: Extension at hip + flexion at knee
In: sciatic n. (tibial n.)
Semimembranosus
O: Ischial tuberosity
I: Medial condyle of tibia
A: Extension at hip + flexion at knee
In: Sciatic n. (tibial n.)
Tibialis anterior
O: Lateral condyle + shaft of tibia + interosseous membrane
I: 1st metatarsal + 1st cuneiform
A: Dorsiflexion of foot + inversion
In: Deep fibular n.
Extensor hallucis longus
O: Ant. fibula + interosseous membrane
I: Distal phalanx of 1st toe
A: Dorsiflexion of foot + Extension of 1st toe
In: Deep fibular n.
Extensor digitorum longus
O: Ant. fibula + Lateral condyle of tibia + interosseous membrane
I: Middle and distal phalanges of toes 2-5
A: Dorsiflexion of foot + Extension of digits 2-5
In: Deep fibular n.
Fibularis Tertius
O: Distal 1/3 of fibula + interosseous membrane
I: Base of 5th metatarsal
A: Dorsiflexion + eversion
In: Deep fibular n.
Gastrocnemius
O: lateral + medial condyles of femur
I: Calcaneus (calcaneal tendon)
A: Plantarflexion of foot + flexion at knee
In: Tibial n.
Soleus
O: Head of fibula + soleal line of tibia
I: Calcaneus (calcaneal tendon)
A: Plantarflexion
In: Tibial n.
Plantaris
O: Lateral supracondylar ridge of femur
I: Calcaneus (calneal tendon)
A: Plantarflexion + flexion at knee
In: Tibial n.
Popliteus
O: Lateral condyle of femur
I: Tibia above popliteal line
A: Flexion + medial rotation at knee; unlock extended knee
In: Tibial n.
Tibialis posterior
O: Post. tibia + post. fibula + interosseous membrane
I: Navicular cuboid + 3 cuneiforms + bases of metatarsals 2-4
A: Plantarflexion + inversion
I: Tibial n.
Flexor Digitorum longus
O: Posterior tibia
I: Distal phalanges 2-5
A: Plantarflexion of foot + flexion of digits 2-5
In: Tibial n.
Flexor Hallucis Longus
O: Distal 2/3 of fibula
I: Distal phalanx of 1st toe
A: Flexion of 1st toe + plantarflexion of foot
In: Tibial n.
Fibularis Longus
O: Head + proximal 2/3 of fibula
I: 1st metatarsal + 1st cuneiform
A: plantarflexion + eversion of foot
In: Superficial fibular n.
Fibularis Brevis
O: Distal 2/3 of fibula
I: Base of 5th metatarsal
A: Plantarflexion + eversion of foot
In: Superficial fibular n.
Extensor digitorum brevis (innervation)
In: Deep fibular n.
Extensor Hallucis brevis (innervation)
In: Deep fibular n.
Flexor digitorum brevis (Innervation)
Medial plantar n.
Abductor hallucis (Innervation)
Medial plantar n.
Abductor Digiti minimi (innervation)
lateral plantar n.
Quadratus plantae (Action + innervation)
A: Flexion of toes 2-5
In: Lateral plantar n.
Lumbricals (Action + innervation)
A: flexion of proximal phalanges; extension of middle + distal phalanges of toes 2-5
In: Medial + lateral plantar n.
Flexor hallucis brevis (innervation)
In: Medial plantar n.
Adductor hallucis (oblique + transverse heads) (innervation)
In: Lateral plantar n.
Flexor digiti minimi brevis (innervation)
In: Lateral plantar n.
Dorsal interossei (4) (action + innervation)
A: Abduction of toes
In: Lateral plantar n.
Plantar interossei (3) (action + innervation)
A: Adduction of toes
In: Lateral plantar n.
