Muscle Actions

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created 8 years ago by Wcc2014
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1

occipitofrantalis

raises the eyebrows

2

orbicularis oculi

closes eye

3

zygomaticus

raises lateral corners of mouth upward. smiling

4

levator labii superioris

opens lips

5

risorius

draws corner of lip laterally. tenses lips

6

depressor labii inferioris

draws lower lip, pout

7

depressor anguli oris

draws corners of mouth down and laterally. tragedy mask, grimace

8

orbicularis oris

closes lips, purses, kissing

9

mentalis

wrinkles chin

10

buccinator

compress check, sucking and blowing

11

platysma

tenses skin of neck

12

masseter

chewing

13

temporalis

chewing

14

medial pterygoid

chewing

15

lateral pterygoid

chewing

16

genioglossus

protracts tongue

17

hyoglossus

depresses tongue

18

styloglossus

retracts and elevates tongue

19

sternocleidomastoid

flexes and laterally rotates the head. both contract=neck flexion. one contract=tilts head to opposite side

20

scalenes

elevates first two ribs

21

iliocostalis

extend and laterally flex the vertebra column

22

longissimus

extend and laterally flex vertebral column. extends head and turns the face toward same side

23

spinalis

extends vertebral column

24

semispinalis

extends vertebral column and head and rotates them to the opposite side

25

quadratus lumborum

flexes vertebral column laterally

26

erector spinae

deepest muscle in back

27

semispinalis

deepest muscle in back

28

quadratus lumborum

deepest muscle in back

29

iliocostalis

erector spinae muscle

30

longissimus

erector spinae muscle

31

spinalis

erector spinae muscle

32

iliocostalis

extends the vertebral column

33

longissimus

extends the vertebral column

34

spinalis

extends the vertebral column

35

semispinalis

extends the vertebral column

36

quadratus lumborum

flexes vertebral column laterally

37

external intercostals

pull ribs toward one another to elevate rib cage

38

internal intercostals

draw ribs together and depress rib cage

39

diaphragm

prime mover of inspiration

40

rectus abdominis

flex and rotate lumbar region of vertebral column, increase intra-abdominal pressure

41

external oblique

flex vertebral column and compress abdominal wall. rotating trunk and flexing laterally

42

internal oblique

flex vertebral column and compress abdominal wall. rotating trunk and flexing laterally

43

transversus abdominis

compress abdominal contents

44

pectoralis minor

ribs fixed, draws scapula forward and downward

45

serratus anterior

rotates scapula so its inferior angle moves laterally and upward

46

subclavius

depression of clavicle

47

trapezius

stabilizes, raises, retracts, and rotates scapula

48

levator scapulae

elevates/adduct scapula

49

rhomboids

stabilize scapula

50

pectoralis major

prime mover of arm flexion, rotates arm medially, adducts arm

51

detoid

primer mover of arm abduction when all its fibers contract simultaneously

52

subscapularis

chief medial rotator of humerus

53

supraspinatus

initiates abduction

54

infraspinatus

rotates humerus laterally

55

teres minor

rotates humerus laterally

56

teres major

extends medially rotates and adducts humerus

57

triceps brachii

powerful forearm extensor

58

anconeus

may control ulnar abduction during forearm pronation

59

biceps brachii

flexes elbow joint and supinates forearm

60

brachialis

a major forearm flexor

61

brachioradialis

synergist in flexing forearm

62

pronator teres

pronates forearm

63

flexor carpi radialis

powerful flexor of wrist

64

palmaris longus

tenses skin and fascia of palm during hand movements

65

flexor carpi ulnaris

powerful flexor of wrist, also adducts hand

66

flexor digitorum superficialis

flexes wrist and middle phalanges of fingers

67

flexor pollicis longus

flexion of wrist. flexion on metacarpal phalanges of thumb

68

flexor digitorum profundus

flexes distal interphalageal joints

69

pronator quadratus

primer mover of forearm pronation

70

extensor carpi radialis

extends wrist

71

extensor carpi radialis brevis

extends and abducts wrist

72

extensor digitorum

primer mover of finger extension

73

extensor carpi ulnaris

extends wrist

74

supinator

assist biceps brachii to forcibly supinate forearm

75

abductor pollicis longus

abducts and extends thum

76

extensor pollicis brevis and longus

extends thumb

77

extensor indicis

extends index finger

78

abductor pollicis brevis

abducts thumb

79

flexor pollicis brevis

flexes thumb

80

opponens pollicis

opposition

81

adductor pollicis

adducts and helps to oppose thumb

82

abductor digit minimi

abducts little finger

83

flexor digit minimi brevis

flexes little finger

84

opponens digit minimi

helps in opposition

85

lumbricals

flex fingers at metacarpophalangeal joints but extends fingers at interphalangel joints

86

palmare interossei

adduct fingers

87

dorsal interossei

abduct fingers

88

sartorius

flexes, abducts, and laterally rotates thigh, cross legged position. tailor muscle.

89

adductor magnus

deep thigh adductor

90

adductor longus

deep thigh adductor

91

adductor brevis

deep thigh adductor

92

pectineus

deep thigh adductor

93

gracilis

deep thigh adductor

94

rectus femoris

extends knee and flexes hip

95

vastus lateralis

extends and stabilizes knee

96

vastus medialis

extends knee

97

rectus femoris

quadriceps muscle

98

vastus lateralis

quadriceps muscle

99

vastus medialis

quadriceps muscle

100

vastus intermedius

quadriceps muscle

101

vastus intermedius

extends knee

102

tensor fascia latae

steadies knee

103

gluteus maxiumus

major extensor of thigh

104

gluteus medius

abducts and medially rotates thigh

105

gluteus minimus

abducts and medially rotates thigh

106

piriformis

deep thigh rotator

107

obturator externus

deep thigh rotator

108

obturator internus

deep thigh rotator

109

gemellus

deep thigh rotator

110

quadratus femoris

deep thigh rotator

111

bieceps formis

hamstring

112

semitendinosus

hamstring

113

semimembranosus

hamstring

114

bieceps formis

extends thigh and flexes knee

115

semitendinosus

extends thigh and flexes knee

116

semimembranosus

extends thigh and flexes knee

117

tibialis anterior

prime mover of dorsiflexion

118

extensor digitorum longus

prime mover of toe extension

119

peroneus tertius

dorsiflexes and everts foot

120

extensor halluces longus

extends great toe

121

peroneus longus

plantar flexes and everts foot

122

peroneus brevis

plantar flexes and everts foot

123

gastrocnemius

plantar flexes foot

124

soleus

plantar flexes foot

125

plantaris

helps to flex knee and plantar flex foot

126

flexor digitorum longus

planter flexes and inverts foot

127

flexor halluis longus

planter flexes and inverts foot; flexes great toe

128

fibialis posterior

primer mover of foot inversion

129

extensor digitorum brevis

helps extend toes at metatarsophalangeal joints

130

flexor digitiorum brevis

helps flex toes

131

abductor hallucis

abducts great toe

132

abductor digiti minimi

abducts and flexes little toe

133

flexor accessorius

straightens out the oblique pull of flexor digitorum longus

134

flexor halluces brevis

flexes great toes

135

adductor halluces

helps maintain travsverse arch of foot

136

flexor digiti minimi brevis

flexes little toe