LE

Question 1

OIN peroneus longus

Answer 1

O: head and proximal 2/3 lateral fibula; lateral tibial condole and rib/fib capsule

I: medial aspect plantar surfaces 1st metatarsal and 1st cuneiform

N: superficial peroneal n.

Question 2

Action peroneus longus

Answer 2

Plantar flexion at ankle

Eversion of foot

Question 3

OIN peroneus brevis

Answer 3

O: distal and lateral 2/3 of fibula

I: base of 5th metatarsal

N: superficial peroneal n

Question 4

Action peroneus brevis

Answer 4

Primarily eversion

Assists plantar flexion

Question 5

OIN peroneus tertius

Answer 5

O: distal 1/3 anterior fibula and interosseous membrane

I: dorsal surface of the base or shaft of 5th metatarsal

N: deep peroneal n

Question 6

Action peroneus tertius

Answer 6

Assist with dorsiflexion at the ankle and eversion of food

Question 7

OIN tibialis anterior

Answer 7

O: Proximal anterolateral 2/3 tibia and adjacent interosseous membrane

I: 1st metatarsal base and medial first cuneiform

N: deep peroneal nerve

Question 8

Action tibialis anterior

Answer 8

Dorsiflexes ankle

Inverts (supinates) foot

Question 9

OIN extensor digitorum longus

Answer 9

O: lateral tibial condole, proximal 2/3 anteromedial fibula, adjacent interosseous membrane

I: medial and distal phalanges of toes 2-5

N: deep peroneal nerve

Question 10

Action exterensor digitorum longus

Answer 10

O: lateral tibial condole, proximal 2/3 anteromedial fibular, interosseous membrane

I: middle and distal phalanges of toes 2-5

N: deep peroneal nerve

Question 11

Action extensor digitorum longus

Answer 11

Extends joints of toes 2-5

Question 12

OIN extensor hallucinate longus

Answer 12

O: middle anterior fibula and adjacent interosseous membrane

I: distal phalanx hallux

N: deep peroneal n

Question 13

Action extensor hallucinate longus

Answer 13

Extends (dorsiflexes) big toe

*with extensor hallucis brevis)

Question 14

OIN flexor digitorum longus

Answer 14

O: middle 1/3 posterior tibia

I: plantar base of distal phalanges of toes 2-5

N: tibial nerve

Question 15

Action: flexor digitorum longus

Answer 15

Flexes toes 2-5

Assists plantar flexion

Question 16

OIN flexor hallicus longus

Answer 16

O: distal 2/3 posterior fibula and interosseous membrane

I: plantar surface of distal phalanx of hallux

N: tibial nerve

Question 17

Action flexor hallicus longus

Answer 17

Flexes hallux

Question 18

OIN tibialis posterior

Answer 18

O: posterior proximal lateral shaft of tibia, proximal medial shaft of fibula, interosseous membrane

I: plantar aspect of cuneiform and bases of metatarsals 2-5; navicular and 1st cuneiform and cuboid

N: tibial nerve

Question 19

Action tibialis posterior

Answer 19

Inversion

Plantar flexion

Question 20

OIN gastrocnemius

Answer 20

O: posterior aspect of femur

I: unites with soleus to form tendo-calcaneus to insert on tuberosity on the posterior aspect of calcaneus

N: tibial nerve

Question 21

Action gastrocnemius

Answer 21

Primary plantar flexors*
Flexes knee**

• with soleus
• *with hamstrings and popliteus

Question 22

OIN soleus

Answer 22

O: soleal line, posterior tibia, proximal posterior fibula

I: unites with gastroc to form Achilles’ tendon to insert on middle part of calcaneal tuberosity

N: tibial nerve

Question 23

Action soleus

Answer 23

Plantar flexion of the foot

Question 24

OIN popliteus

Answer 24

O: lateral femoral epicondyle

I: posterior aspect proximal tibia

N: tibial n

Question 25

Action popliteus

Answer 25

Internally rotates tibial in open kinetic chain | Externally rotates femur when tibia is fixed (closed kinetic chain)

Question 26

OIN semitendinosus

Answer 26

O: ischial tuberosity I: proximal medial tibia and pes anserinus N: tibial n

Question 27

Action semitendinosus

Answer 27

Primarily knee flexion Internally rotates tibia Assists hip extension and internal rotation **same as semimembranosus**

Question 28

OIN semimembranosus

Answer 28

O: ischial tuberosity I: posterior medial tibial condyle N: tibial nerve

Question 29

Action semimembranosus

Answer 29

Primarily knee flexion Internally rotates tibia Assists hip extension and internal rotation **same as semitendinosus**

Question 30

OIN biceps femoris

Answer 30

O: 2 heads LONG O: ischial tuberosity SHORT O: lateral linea aspera and lateral supracondylar line of posterior distal femur I: superolateral aspect of fibular head N: sciatic LONG: tibial SHORT: peroneal n

Question 31

Action biceps femoris

Answer 31

Knee flexion When knee is flexed: externally rotates leg LONG: extension and external rotation at hip

Question 32

OIN sartorius

Answer 32

O: ASIS I: pes anserine - proximal medial tibia N: femoral n

Question 33

Action sartorius

Answer 33

HIP: Flexes, ABDucts, laterally rotates KNEE: flexes and medially rotates

Question 34

OIN rectus femoris

Answer 34

O: AIIS, brim of acetabulum I: tibial tuberosity via infrapatellar tendon N: femoral n

Question 35

Action rectus femoris

Answer 35

Extends knee | Flexes hip

Question 36

OIN vastus intermedius

Answer 36

O: anterolateral proximal 2/3 of femur I: tibial tuberosity N: femoral n

Question 37

Action vastus intermedius

Answer 37

Knee extension

Question 38

OIN vastus medialis

Answer 38

O: medial femur I: tibial tuberosity N: femoral nerve

Question 39

Action vastus medialis

Answer 39

Knee extension

Question 40

OIN vastus lateralis

Answer 40

O: posterior greater trochanter, lateral gluteal tuberosity, proximal 1/2 lateral lip of linea aspera I: tibial tuberosity N: femoral nerve

Question 41

Action vastus lateralis

Answer 41

Knee extension