O/I/A/In.: Muscles of lower extremity

Question 1

Psoas Major

Answer 1

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

Question 2

Psoas Minor

Answer 2

O: T12-L1
I: Iliopectineal line or fused w/ psoas maj.
A: Flexion of pelvis on abdomen
In: Lumbar plexus

Question 3

Iliacus

Answer 3

O: Iliac fossa + sacrum
I: Tendon of psoas maj. (lesser troch)
A: Flexion + lateral rotation of thigh at hip
In: Femoral n.

Question 4

Gluteus maximus

Answer 4

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.

Question 5

Gluteus medius

Answer 5

O: Btwn ant. and post. gluteal lines
I: Greater trochanter of femur
A: Abduction + medial rotation of thigh
In: sup. gluteal n.

Question 6

Gluteus minimus

Answer 6

O: btwn ant. and inf. gluteal lines
I: greater trochanter
A: abduction + medial rotation of thigh
In: sup. gluteal n.

Question 7

Tensor Fascia Latae

Answer 7

O: ASIS + iliac crest
I: IT which attaches to lateral tibia
A: Flexion + abduction of thigh at hip
In: sup. gluteal n.

Question 8

Piriformis

Answer 8

O: Ant. surface of sacrum
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Sacral plexus

Question 9

Superior Gemellus

Answer 9

O: ischial spine
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus

Question 10

Obturator Internus

Answer 10

O: inner surface of obturator foramen + pubis + ischium
I: greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus

Question 11

Inferior gemellus

Answer 11

O: Ischial tuberosity
I: Greater trochanter
A: Lateral rotation + abduction of thigh
In: Lumbosacral plexus

Question 12

Quadratus femoris

Answer 12

O: ischial tuberosity
I: quadrate tubercle of femur
A: lateral rotation of thigh
In: Lumbosacral plexus

Question 13

Obturator externus

Answer 13

O: outer surface of obturator foramen + membrane
I: trochanteric fossa of femur
A: lateral rotation + abduction of thigh
In: Obturator n.

Question 14

Sartorius

Answer 14

O: ASIS
I: proximal, medial shaft of tibia
A: Flexion + abduction + lateral rotation of thigh at hip; flexion of knee
In: Femoral n.

Question 15

Rectus Femoris

Answer 15

O: AIIS
I: Patella (quadriceps tendon) then tibial tuberosity (patellar lig)
A: Flexion at hip; Extension at knee
In: Femoral n.

Question 16

Vastus Lateralis

Answer 16

O: Greater trochanter + lateral margin of linea aspera of femur
I: Patella + tib tub
A: Knee extension
In: Femoral n.

Question 17

Vastus Medialis

Answer 17

O: medial margin of linear aspera
I: Patella + tib tub
A: Extension of knee
In: Femoral n.

Question 18

Vastus Intermedius

Answer 18

O: Ant. + lat. shaft of femur
I: Patella + tib tub
A: Extension of knee
In: Femoral n.

Question 19

Pectineus

Answer 19

O: Superior ramus of pubis
I: Pectineal line of femur
A: Flexion + adduction at hip
In: Femoral n.

Question 20

Adductor Brevis

Answer 20

O: Inferior ramus of pubis
I: Superior half of linea aspera
A: adduction + flexion + rotation at hip
In: Obturator n.

Question 21

Adductor Longus

Answer 21

O: Pubic crest + symphysis
I: Linea aspera
A: Adduction + flexion + rotation at hip
In: Obturator n.

Question 22

Adductor Magnus

Answer 22

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.

Question 23

Adductor Minimus

Answer 23

O: Inferior ramus of pubis
I: Medial lip of linea aspera
A: adduction + lateral rotation at hip
In: Obturator n.

Question 24

Gracilis

Answer 24

O: Body + inferior ramus of pubis
I: Proximal, medial shaft of tibia
A: adduction at hip; flexion + medial rotation at knee
In: Obturator n.

Question 25

Biceps femoris

Answer 25

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.)

Question 26

Semitendinosus

Answer 26

O: Ischial tuberosity I: Proximal, medial shaft of tibia A: Extension at hip + flexion at knee In: sciatic n. (tibial n.)

Question 27

Semimembranosus

Answer 27

O: Ischial tuberosity I: Medial condyle of tibia A: Extension at hip + flexion at knee In: Sciatic n. (tibial n.)

Question 28

Tibialis anterior

Answer 28

O: Lateral condyle + shaft of tibia + interosseous membrane I: 1st metatarsal + 1st cuneiform A: Dorsiflexion of foot + inversion In: Deep fibular n.

Question 29

Extensor hallucis longus

Answer 29

O: Ant. fibula + interosseous membrane I: Distal phalanx of 1st toe A: Dorsiflexion of foot + Extension of 1st toe In: Deep fibular n.

Question 30

Extensor digitorum longus

Answer 30

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.

Question 31

Fibularis Tertius

Answer 31

O: Distal 1/3 of fibula + interosseous membrane I: Base of 5th metatarsal A: Dorsiflexion + eversion In: Deep fibular n.

Question 32

Gastrocnemius

Answer 32

O: lateral + medial condyles of femur I: Calcaneus (calcaneal tendon) A: Plantarflexion of foot + flexion at knee In: Tibial n.

Question 33

Soleus

Answer 33

O: Head of fibula + soleal line of tibia I: Calcaneus (calcaneal tendon) A: Plantarflexion In: Tibial n.

Question 34

Plantaris

Answer 34

O: Lateral supracondylar ridge of femur I: Calcaneus (calneal tendon) A: Plantarflexion + flexion at knee In: Tibial n.

Question 35

Popliteus

Answer 35

O: Lateral condyle of femur I: Tibia above popliteal line A: Flexion + medial rotation at knee; unlock extended knee In: Tibial n.

Question 36

Tibialis posterior

Answer 36

O: Post. tibia + post. fibula + interosseous membrane I: Navicular cuboid + 3 cuneiforms + bases of metatarsals 2-4 A: Plantarflexion + inversion I: Tibial n.

Question 37

Flexor Digitorum longus

Answer 37

O: Posterior tibia I: Distal phalanges 2-5 A: Plantarflexion of foot + flexion of digits 2-5 In: Tibial n.

Question 38

Flexor Hallucis Longus

Answer 38

O: Distal 2/3 of fibula I: Distal phalanx of 1st toe A: Flexion of 1st toe + plantarflexion of foot In: Tibial n.

Question 39

Fibularis Longus

Answer 39

O: Head + proximal 2/3 of fibula I: 1st metatarsal + 1st cuneiform A: plantarflexion + eversion of foot In: Superficial fibular n.

Question 40

Fibularis Brevis

Answer 40

O: Distal 2/3 of fibula I: Base of 5th metatarsal A: Plantarflexion + eversion of foot In: Superficial fibular n.

Question 41

Extensor digitorum brevis (innervation)

Answer 41

In: Deep fibular n.

Question 42

Extensor Hallucis brevis (innervation)

Answer 42

In: Deep fibular n.

Question 43

Flexor digitorum brevis (Innervation)

Answer 43

Medial plantar n.

Question 44

Abductor hallucis (Innervation)

Answer 44

Medial plantar n.

Question 45

Abductor Digiti minimi (innervation)

Answer 45

lateral plantar n.

Question 46

Quadratus plantae (Action + innervation)

Answer 46

A: Flexion of toes 2-5 In: Lateral plantar n.

Question 47

Lumbricals (Action + innervation)

Answer 47

A: flexion of proximal phalanges; extension of middle + distal phalanges of toes 2-5 In: Medial + lateral plantar n.

Question 48

Flexor hallucis brevis (innervation)

Answer 48

In: Medial plantar n.

Question 49

Adductor hallucis (oblique + transverse heads) (innervation)

Answer 49

In: Lateral plantar n.

Question 50

Flexor digiti minimi brevis (innervation)

Answer 50

In: Lateral plantar n.

Question 51

Dorsal interossei (4) (action + innervation)

Answer 51

A: Abduction of toes In: Lateral plantar n.

Question 52

Plantar interossei (3) (action + innervation)

Answer 52

A: Adduction of toes In: Lateral plantar n.