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Full Anatomy Course (MbChB) > MSK Muscle actions > Flashcards

MSK Muscle actions Flashcards

1
Q

What is the action of Levator scapulae?

A

Elevates scapula

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2
Q

What is the action of trapezius?

A

Upper Fibres: Elevates and rotates scapula
Middle Fibres: retract Scapula
Lower Fibres: Pull scapula inferiorly

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3
Q

What is the action of latissimus dorsi?

A

Extends, adducts and medially rotates

upper limb

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4
Q

What is the action of the rhomboids?

A

Retract and medial rotation scapula

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5
Q

What is the action of Serratus posterior superior?

A

Elevates ribs 2-5

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6
Q

What is the action of serrates posterior inferior?

A

Depresses ribs 9-12

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7
Q

What is the action of erector spinae?

A

Acts unilaterally to laterally flex the
vertebral column. Acts bilaterally to
extend the vertebral column and head.

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8
Q

What is the action of Pectoralis major?

A

Adducts and medially rotates upper limb. Draws scapula
anteroinferior
Clavicular head only acts to flex upper limb

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9
Q

What is the action of Pectoralis minor?

A

Stabilises scapula by drawing it anteroinferior against

thoracic wall

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10
Q

What is the action of serratus anterior?

A

abducts and protracts scapula

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11
Q

What is the action of Supraspinatus?

A

Abducts the arm 0-15 degrees and assists deltoid for 15-90

degrees

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12
Q

What is the action of infraspinatus?

A

Lateral rotation

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13
Q

What is the action of subscapularis?

A

medial rotation and adduction

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14
Q

What is the action of teres minor?

A

lateral rotation and adduction

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15
Q

What is the action of teres major?

A

Adduction, extension & medial rotation

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16
Q

What is the action of deltoid?

A

Anterior fibres – flexion and medial rotation.
Posterior fibres – extension and lateral rotation.
Middle fibres – the major abductor of the arm (takes over from the supraspinatus, which abducts the first 15 degrees).

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17
Q

What is the action of biceps brachii

A

Flexes shoulder & elbow. Supinates forearm

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18
Q

What is the action of brachialis?

A

Flexes the elbow

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19
Q

What is the action of coracobrachialis?

A

Flexion and adduction of the shoulder joint

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20
Q

What is the action of triceps brachii and anconeus?

A

Extension of the elbow

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21
Q

What is the function of flexor carpi ulnaris?

A

Flexion and adduction of the wrist

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22
Q

What is the action of palmaris longus?

A

Flexion of the wrist

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23
Q

What is the action of pronator teres?

A

Pronates and weakly flexes the elbow

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24
Q

What is the action of brachioradialis?

A

flexes the elbow

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25
Q

What is the action of flexor digitorum superficialis?

A

flexes the wrist, MCP and PIP joints

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26
Q

What is the action of flexor digitorum profundus?

A

Flexes wrist, MCP, PIP and DIP joints

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27
Q

What is the action of flexor pollicis longus

A

Flexion of the thumb at the interphalangeal joint

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28
Q

What is the action of pronator quadratus?

A

Pronation

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29
Q

What is the action of extensor carpi radials longus?

A

Extends and abducts wrist

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30
Q

What is the action of extensor carpi radials brevis?

A

Extends and abducts wrist

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31
Q

What is the action of extensor digitorum?

A

Extends the wrist & digits at MCP, DIP and PIP joints

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32
Q

What is the action of extensor digiti minimi?

A

Extends wrist & little finger and MCP, DIP and PIP joints

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33
Q

What is the action of extensor carpi ulnaris?

A

Extension and abduction of wrist

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34
Q

What is the action of supinator?

A

Supination

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35
Q

What is the action of abductor pollicis longus?

A

Abduction of thumb

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36
Q

What is the action of extensor pollicis longus?

A

Extension of thumb at MCP and IP joint

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37
Q

What is the action of extensor pollicis brevis?

A

Extension of thumb at MCP joint

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38
Q

What is the action of extensor indicus?

A

Extends index finger at all joints

39
Q

What is the function of opponens pollicis?

A

opposes thumb

40
Q

What is the action of abductor pollicis brevis?

A

Abduction of the thumb

41
Q

What is the action of flexor pollicis brevis?

A

Flexion of the thumb at MCP joint

42
Q

What is the action of opponens minimi?

A

Opposes little finger

43
Q

What is the action of abductor digiti minimi?

A

Abducts little finger at MCP joint

44
Q

What is the action of flexor digiti minimi brevis?

A

Flexes MCP joint of little finger

45
Q

What is the function of the lumbricals?

A

FLEX THE FINGERS AT THE METACARPOPHALANGEAL (MCP) JOINTS, AND EXTEND THEM AT THE INTERPHALANGEAL (IP) JOINTS.

46
Q

What is the action of the dorsal interossei?

A

DAB- Abduction of the digits at the MCP joint

47
Q

What is the action of the Palmar interossei?

A

PAD- Adduction of the digits at the MCP joint

48
Q

What is the action of adductor pollicis?

A

Adduction of the thumb at the MCP joint

49
Q

What is the action of gluteus Maximus?

A

extension of hip & lateral rotation of thigh

50
Q

What is the action of gluteus medius and gluteus minimus?

A

Medial rotation
Abduction

Also secures the pelvis in locomotion preventing drop of the opposite limb

51
Q

What is the action of tensor fascia latae?

A

extension and lateral rotation of leg on the knee joint.

weak abductor and medial rotator of the hip.

52
Q

What is the action of piriformis?

A

Lateral rotation and abduction of the thigh

53
Q

What is the action of obturator internus

A

Lateral rotation and abduction

54
Q

What is the action of the gemelli muscles?

A

Lateral rotation and abduction

55
Q

What is the action of vastas lateralis?

A

Extends the leg at the knee

stabilises patella

56
Q

What is the action of rectus femoris?

A

extends the leg at the knee

flexes thigh at hip

57
Q

What is the action of vastas medalis?

A

Extends the leg at the knee

Stabilises patella

58
Q

What is the action of vastas intermedius?

A

extends the leg at the knee

Stabilises the patella

59
Q

What is the action of iliopsoas?

A

Flexion of the hip

60
Q

What is the action of pectineus?

A

Adduction and flexion at the hip

61
Q

What is the action of obturator externus?

A

Abduction and lateral rotation of thigh

62
Q

What is the action of adductor brevis?

A

Adduction of thigh

63
Q

What is the function of adductor longus?

A

Adduction of thigh

64
Q

What is the function of adductor Magnus?

A

Adducts and medially rotates thigh

65
Q

What is the action of gracilis?

A

Adduction of hip

Flexion of knee

66
Q

What is the action of biceps femoris?

A

Lateral rotation at hip and knee
Extension of hip
Flexion of knee

67
Q

What is the action of semitendinosis?

A

medial rotation of the hip and knee
Extension of hip
Flexion of knee

68
Q

What is the function of semimembranosis?

A

Medial rotation of hip and knee
Extension of hip
Flexion at the knee

69
Q

What is the action of tibialis anterior?

A

Dorsiflexion of foot at ankle

inversion of foot at ankle

70
Q

What is the function of extensor digitorum longus?

A

Dorsiflexion of the foot at the ankle

extension of lateral 4 toes

71
Q

What is the action of extensor hallucis longus?

A

Dorsiflexion of the foot at the ankle and extension of the great toe

72
Q

What is the action of fibularis tertius?

A

Dorsiflexion and eversion of the foot at the ankle

73
Q

What is the action of fibularis longus?

A

Plantarflexion and eversion of the foot (also supports lateral and transverse arches)

74
Q

What is the action of fibularis brevis?

A

Eversion of the foot at the ankle

75
Q

What is the action of gastrocnemius?

A

Knee flexion

Plantarflexion

76
Q

What is the action of plantaris??

A

Knee flexion

plantar flexion and inversion of the foot at the ankle

77
Q

What is the action of soleus?

A

Plantarflexion and inversion of the foot at the ankle

78
Q

What is the action of popliteus?

A

Laterally rotates the femur on the tibia which “unlocks” the knee and permits flexion

79
Q

What is the action of tibias posterior?

A

Plantarflexion and inversion of the foot at the ankle

maintains the medial arch of the foot

80
Q

What is the action of flexor digitorum longus?

A

Flexes the lateral 4 toes

81
Q

What is the action of flexor hallicus longus?

A

Flexes the great toe

82
Q

What is the action of extensor digitorum brevis?

A

Extends medial 4 toes at the MTP and IP joints

83
Q

What is the action of extensor hallicus brevis?

A

Extends great toes at MTP joint

84
Q

What is the action of abductor hallicus?

A

Abducts and flexes great toe

85
Q

What is the action of flexor digitorum brevis?

A

Flexes lateral four digits at proximal interphalangeal joints

86
Q

What is the action of abductor digiti minimi?

A

Abducts and flexes 5th digit

87
Q

What is the action of quadratus plantae?

A

Flexion of lateral 4 digits

88
Q

What is the action of the lumbricals of the foot?

A

Flexes at metatarsophalangeal joints, while extending interphalangeal joint

89
Q

What is the action of flexor hallicus brevis?

A

Flexes proximal phalanx of the great toe at metatarsophalangeal joint

90
Q

What is the action of adductor hallicus?

A

Adducts great toe

Assist in forming transverse arch of the foot

91
Q

What is the action of flexor digiti minimi brevis?

A

Flexes the proximal phalanx of the 5th digit

92
Q

What is the action of the plantar interossei of the foot?

A

Adducts digits three to five and flex metatarsophalangeal joint

93
Q

What is the action of the dorsal interossei of the foot?

A

Abducts digits two to four and flex metatarsophalangeal joints

Full Anatomy Course (MbChB) (16 decks)

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