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Muscle actions Flashcards

1
Q

Masseter

A

Elevates mandible

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2
Q

Temporalis

A

Elevates mandible

Retracts mandible

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3
Q

Sternocleidomastoid

A

• Flexes head
• Rotates head
laterally

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4
Q

Scalenes – anterior,

middle, posterior

A
  • Elevates ribs 1-2
  • Flexes neck
  • Rotates neck
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5
Q

Pectoralis minor Ribs 3-5

A

• Depresses scapula
• Downwardly rotates
scapula

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6
Q

External intercostals Inferior border of

ribs

A

• Elevates rib cage

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7
Q

Internal intercostals Superior border of

ribs

A

Depresses rib cage

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8
Q

Serratus anterior Ribs 1-8

A

Rotates inferior
angle of scapula
laterally

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9
Q

External oblique Ribs 5-12

A

• Flexes vertebral
column
• Compresses
abdominal wall

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10
Q

Internal oblique

A

• Flexes vertebral
column
• Compresses
abdominal wall

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11
Q

Rectus abdominis

A 
• Flexes lumbar
region of vertebral
column
• Rotates lumbar
region of vertebral
column
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12
Q

Trapezius

A
  • Elevates scapula
  • Depresses scapula
  • Rotates scapula
  • Adducts scapula
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13
Q

Deltoid

A 
• Abducts arm
• Flexes arm at
shoulder
• Rotates arm
medially
• Extends arm at
shoulder
• Rotates arm
laterally
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14
Q

Latissimus dorsi

A 
• Extends arm at
shoulder
• Adducts arm
• Rotates arm
medially
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15
Q

Pectoralis major

A 
• Flexes arm at
shoulder
• Rotates arm
medially
• Adducts arm
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16
Q

Levator scapula(e)

A

• Elevates scapula
• Downwardly rotates
scapula

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17
Q

Rhomboid minor

A

• Adducts scapula
• Downwardly rotates
scapula

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18
Q

Rhomboid major

A

• Adducts scapula
• Downwardly rotates
scapula

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19
Q

Supraspinatus

A

• Abducts arm

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20
Q

Infraspinatus

A

• Rotates arm

laterally

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21
Q

Teres minor

A

• Rotates arm

laterally

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22
Q

Teres major

A 
• Adducts arm
• Rotates arm
medially
• Extends arm at
shoulder
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23
Q

Subscapularis

A

• Rotates arm

medially

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24
Q

Biceps brachii

A

• Flexes forearm at
elbow
• Supinates forearm

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25
Q

Brachialis

A

• Flexes forearm at

elbow

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26
Q

Coracobrachialis

A

• Flexes arm at
shoulder
• Adducts arm

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27
Q

Triceps brachii

A

• Extends forearm at

elbow

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28
Q

Pronator teres

A

• Pronates forearm

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29
Q

Flexor carpi radialis

A

• Flexes hand at
wrist
• Abducts hand

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30
Q

Palmaris longus

A

• Flexes hand at

wrist

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31
Q

Flexor carpi ulnaris

A

• Flexes hand at
wrist
• Adducts hand

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32
Q

Flexor digitorum

superficialis

A 
• Flexes hand at
wrist
• Flexes proximal
interphalangeal
joints
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33
Q

Flexor digitorum

profundus

A

• Flexes distal
interphalangeal
joints

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34
Q

Flexor pollicis longus

A

• Flexes 1st
interphalangeal
joints

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35
Q

Pronator quadratus

A

• Pronates forearm

36
Q

Brachioradialis

A 
• Flexes forearm at
elbow
• Stabilizes elbow
during flexion and
extension
37
Q

Extensor carpi radialis

longus

A

• Extends hand at
wrist
• Abducts hand

38
Q

Extensor carpi radialis

brevis

A

• Extends hand at
wrist
• Abducts hand

39
Q

Extensor digitorum

A 
• Extends distal
interphalangeal
joints
• Extends hand at
wrist
40
Q

Extensor carpi ulnaris •

A

• Extends hand at
wrist
• Adducts hand

41
Q

Supinator

A

• Supinates forearm

42
Q

Abductor pollicis longus

A

Abducts pollex

43
Q

Extensor pollicis brevis

A

• Extends 1st
metacarpalphalangeal
joint

44
Q

Extensor pollicis longus

A

• Extends 1st
interphalangeal
joint

45
Q

Extensor indicis

A

• Extends 2nd distal
interphalangeal
joint

46
Q

Extensor digiti minimi

A

Extends 5th distal
interphalangeal
joint

47
Q

Abductor pollicis brevis •

A

• Abducts pollex

48
Q

Opponens pollicis

A

• Opposes pollex

49
Q

Flexor pollicis brevis

A

• Flexes 1st
metacarpalphalangeal
joint

50
Q

Adductor pollicis

A
  • Adducts pollex

* Opposes pollex

51
Q

Iliopsoas

A

• Flexes thigh at hip
• Flexes vertebral
column

52
Q

Sartorius

A

• Flexes thigh at hip
• Rotates thigh
laterally
• Flexes leg at knee

53
Q

Rectus femoris •

A
  • Extends leg at knee

* Flexes thigh at hip

54
Q

Vastus lateralis •

A
  • Extends leg at knee

* Stabilizes knee

55
Q

Vastus medialis •

A
  • Extends leg at knee

* Stabilizes patella

56
Q

Vastus intermedius

A

• Extends leg at knee

57
Q

Pectineus

A

• Adducts thigh
• Flexes thigh at hip
• Rotates thigh
medially

58
Q

Tensor fascia latae

A

• Flexes thigh at hip
• Abducts thigh
• Rotates thigh
medially

59
Q

Gracilis

A

• Adducts thigh
• Flexes leg at knee
• Rotates leg
medially

60
Q

Adductor longus

A

• Adducts thigh
• Flexes thigh at hip
• Rotates thigh
medially

61
Q

Adductor brevis

A

• Adducts thigh
• Rotates thigh
medially

62
Q

Adductor magnus

A

• Adducts thigh
• Rotates thigh
laterally
• Flexes thigh at hip

63
Q

Gluteus maximus

A

• Extends thigh at hip
• Rotates thigh
laterally
• Abducts thigh

64
Q

Gluteus medius

A

• Abducts thigh
• Rotates thigh
medially

65
Q

Gluteus minimis

A

• Abducts thigh
• Rotates thigh
medially

66
Q

Biceps femoris

A
  • Extends thigh at hip
  • Flexes leg at knee
  • Rotates leg laterally
67
Q

Semitendinosus

A

• Extends thigh at hip
• Flexes leg at knee
• Rotates leg
medially

68
Q

Semimembranosus

A

• Extends thigh at hip
• Flexes leg at knee
• Rotates leg
medially

69
Q

Piriformis

A

• Rotates thigh
laterally when hip is
extended

70
Q

Quadratus femoris

A

• Rotates thigh
laterally
• Stabilizes hip

71
Q

Tibialis anterior

A

• Dorsiflexes foot at
ankle
• Inverts foot

72
Q

Extensor hallucis longus •

A 
• Dorsiflexes foot at
ankle
• Extends 1st
interphalangeal
joint
73
Q

Extensor digitorum

longus

A

• Extends 2nd-5th
distal
interphalangeal
joints

74
Q

Fibularis (peroneus)

tertius

A

• Dorsiflexes foot at
ankle
• Everts foot

75
Q

Fibularis (peroneus)

longus

A

• Plantar flexes foot
at ankle
• Everts foot

76
Q

Fibularis (peroneus)

brevis

A

• Plantar flexes foot
at ankle
• Everts foot

77
Q

Gastrocnemius

A

Plantar flexes foot

at ankle

78
Q

Soleus

A

• Plantar flexes foot

at ankle

79
Q

Flexor digitorum longus •

A 
• Plantar flexes foot
at ankle
• Inverts foot
• Flexes 2nd-5th distal
interphalangeal
joints
80
Q

Flexor hallucis longus

A 
• Plantar flexes foot
at ankle
• Inverts foot
• Flexes all joints of
hallux
81
Q

Tibialis posterior

A

• Plantar flexes foot
at ankle
• Inverts foot

82
Q

Iliocostalis

A

• Extends vertebral
column
• Laterally flexes
vertebral column

83
Q

Longissimus •

A

• Extends vertebral
column
• Laterally flexes
vertebral column

84
Q

Spinalis •

A

• Extends vertebral

column

85
Q

Splenius capitis

A

• Extends or
hyperextends
vertebral column

86
Q

Semispinalis capitis

A

• Extends vertebral

column

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