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Muscles > Actions_Lower Extremity > Flashcards

Actions_Lower Extremity Flashcards

1
Q

Psoas Major

A

Hip flexion (origin fixed)
Trunk flexion (insertion fixed; as in sit-up)
Assist lateral trunk flexion (unilateral action)
May assist hip ER and ABD
With insertion fixed, tightness contributes to increase lordosis

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2
Q

Psoas Minor

A

Flexion of trunk and lumbar spine

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3
Q

Illiacus

A

Hip flexion

Flexes pelvis on femur

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4
Q

Pectineus

A

Hip adduction

Assist hip flexion

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5
Q

Gracilis

A

Hipp adduction
Knee flexion
MR of knee

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6
Q

Adductor Longus

A

Hip adduction

Assist hip flexion

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7
Q

Adductor Brevis

A

Hip adduction

Hip flexion

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8
Q

Adductor Magnus

A

Hip adduction
May assist hip extension and flexion
Role in hip rotation depends on thigh position

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9
Q

Gluteus Maximus

A

Hip extension
Hip ER
Lower fibers assist hip ADD
Upper fibers assist hip ABD

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10
Q

Gluteus Medius

A 
Hip ABD
Hip ER (posterior fibers)
Hip IR (anterior fibers)
Anterior fibers may assist flexion
Posterior fibers may assist extension
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11
Q

Gluteus Minimus

A

Hip ABD

Hip IR

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12
Q

Tensor Fascia Latae

A

Hip flexion
Hip IR
Hip ABD

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13
Q

Piriformis

A

Hip ER
Assist hip ABD when hip is flexed
Assist hip EXT

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14
Q

Obturator Internus

A

Hip ER

Assist hip ABD when hip is flexed

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15
Q

Obturator Externus

A

Hip ER

Assist hip ADD

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16
Q

Gemellus Superior

A

Hip ER

Assist hip ABD when hip is flexed

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17
Q

Gemellus Inferior

A

Hip ER

Assist hip ABD when hip is flexed

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18
Q

Quadratus Femoris

A

Hip ER

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19
Q

Biceps Femoris

A

Knee flexion
Knee ER
Hip extension (long head only)
Assist Hip ER (long head only)

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20
Q

Semitendinosus

A

Knee flexion
Knee IR
Hip extension
Assist hip IR

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21
Q

Semimembranosus

A

Knee flexion
Knee IR
Hip extension
Assist hip IR

22
Q

Sartorius

A 
Hip ER
Hip ABD
Hip flexion
Knee flexion
Knee IR
23
Q

Rectus Femoris

A

Knee extension

Hip flexion

24
Q

Vastus Lateralis

A

Knee extension

25
Q

Vastus Intermedius

A

Knee extension

26
Q

Vastus Medialis (inclues longus and oblique medialis fibers)

A

Knee extension

27
Q

Articularis Genus

A

Retracts synovial membrane during knee extension prevent its entrapment between patella and femur

28
Q

Popliteus

A 
Knee flexion
Knee IR (origin fixed)
Hip ER (insertion fixed)
29
Q

Tibialis Anterior

A

Ankle DR

Foot INV

30
Q

Tibialis Posterior

A

Foot INV

Assist PF

31
Q

Gastrocnemius

A

Ankle PF
Foot INV (supination)
Assist knee flexion

32
Q

Soleus

A

Ankle PF

33
Q

Plantaris

A

Ankle PF

Assist knee flexion

34
Q

Peroneus Longus

A

Foot EVE
Assist PF
Depression of 1st metatarsal

35
Q

Peroneus Brevis

A

Foot EVE

Assist PF

36
Q

Peroneus Tertius

A

Ankle DF

Foot EVE

37
Q

Extensor Digitorum Longus

A

MP extension (of 4 lesser toes)
Assist PIP and DIP extension (of lesser toes)
Assist ankle DF and eversion

38
Q

Extensor Digitorum Brevis

A

MP extension of toes 2 to 4
Assist IP extension of toes 2 to 4
MP extension of great toe (via its most medial slip of tendon, also called extensor hallucis brevis; no slip to 5th toed from EDBr)

39
Q

Flexor Digitorum Longus

A

MP, PIP, DIP flexion of toes 2-5
Assist PF
Assist INV

40
Q

Flexor Digitorum Brevis

A

MP and PIP flexion of toes 2-5

41
Q

Abductor Digiti Minimi

A

Toe 5 ABD

Toe 5 MP flexion

42
Q

Flexor Digiti Minimi Brevis

A

Toe 5 MP flexion

43
Q

Quadratus Plantar

A

DIP flexion of toes 2-5 (in synergy with FDL)

44
Q

Lumbricales

A

MP flexion of toes 2-5

Assist PIP and DIP extension of toes 2-5

45
Q

Dorsal Interossei

A

ABD of toes 2-4
Assist MP flexion of toes 2-4
May assist IP extension of toes 2-4

46
Q

Plantar Interossei

A

ADD of toes 3, 4, 5
Assist MP flexion of toes 3, 4, 5
May assist IP extension of toes 3, 4, 5

47
Q

Extensor Hallucis Longus

A

MP and IP extension
Assist DF
Assist foot INV

48
Q

Flexor Hallucis Longus

A

Great toe IP flexion
Assist great toe MP flexion
Assist ankle PF and food INV

49
Q

Flexor Hallucis Brevis

A

Great toe MP flexion

50
Q

Abductor Hallucis

A

ABD of great toe
Assist great toe MP flexion
Assist forefoot ADD

51
Q

Adductor Hallucis

A

Great toe adduction

Assist great toe MP flexion

Muscles (12 decks)

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