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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
Brachialis
• Flexes forearm at | elbow
26
Coracobrachialis
• Flexes arm at shoulder • Adducts arm
27
Triceps brachii
• Extends forearm at | elbow
28
Pronator teres
• Pronates forearm
29
Flexor carpi radialis
• Flexes hand at wrist • Abducts hand
30
Palmaris longus
• Flexes hand at | wrist
31
Flexor carpi ulnaris
• Flexes hand at wrist • Adducts hand
32
Flexor digitorum | superficialis
``` • Flexes hand at wrist • Flexes proximal interphalangeal joints ```
33
Flexor digitorum | profundus
• Flexes distal interphalangeal joints
34
Flexor pollicis longus
• Flexes 1st interphalangeal joints
35
Pronator quadratus
• Pronates forearm
36
Brachioradialis
``` • Flexes forearm at elbow • Stabilizes elbow during flexion and extension ```
37
Extensor carpi radialis | longus
• Extends hand at wrist • Abducts hand
38
Extensor carpi radialis | brevis
• Extends hand at wrist • Abducts hand
39
Extensor digitorum
``` • Extends distal interphalangeal joints • Extends hand at wrist ```
40
Extensor carpi ulnaris •
• Extends hand at wrist • Adducts hand
41
Supinator
• Supinates forearm
42
Abductor pollicis longus
Abducts pollex
43
Extensor pollicis brevis
• Extends 1st metacarpalphalangeal joint
44
Extensor pollicis longus
• Extends 1st interphalangeal joint
45
Extensor indicis
• Extends 2nd distal interphalangeal joint
46
Extensor digiti minimi
Extends 5th distal interphalangeal joint
47
Abductor pollicis brevis •
• Abducts pollex
48
Opponens pollicis
• Opposes pollex
49
Flexor pollicis brevis
• Flexes 1st metacarpalphalangeal joint
50
Adductor pollicis
* Adducts pollex | * Opposes pollex
51
Iliopsoas
• Flexes thigh at hip • Flexes vertebral column
52
Sartorius
• Flexes thigh at hip • Rotates thigh laterally • Flexes leg at knee
53
Rectus femoris •
* Extends leg at knee | * Flexes thigh at hip
54
Vastus lateralis •
* Extends leg at knee | * Stabilizes knee
55
Vastus medialis •
* Extends leg at knee | * Stabilizes patella
56
Vastus intermedius
• Extends leg at knee
57
Pectineus
• Adducts thigh • Flexes thigh at hip • Rotates thigh medially
58
Tensor fascia latae
• Flexes thigh at hip • Abducts thigh • Rotates thigh medially
59
Gracilis
• Adducts thigh • Flexes leg at knee • Rotates leg medially
60
Adductor longus
• Adducts thigh • Flexes thigh at hip • Rotates thigh medially
61
Adductor brevis
• Adducts thigh • Rotates thigh medially
62
Adductor magnus
• Adducts thigh • Rotates thigh laterally • Flexes thigh at hip
63
Gluteus maximus
• Extends thigh at hip • Rotates thigh laterally • Abducts thigh
64
Gluteus medius
• Abducts thigh • Rotates thigh medially
65
Gluteus minimis
• Abducts thigh • Rotates thigh medially
66
Biceps femoris
* Extends thigh at hip * Flexes leg at knee * Rotates leg laterally
67
Semitendinosus
• Extends thigh at hip • Flexes leg at knee • Rotates leg medially
68
Semimembranosus
• Extends thigh at hip • Flexes leg at knee • Rotates leg medially
69
Piriformis
• Rotates thigh laterally when hip is extended
70
Quadratus femoris
• Rotates thigh laterally • Stabilizes hip
71
Tibialis anterior
• Dorsiflexes foot at ankle • Inverts foot
72
Extensor hallucis longus •
``` • Dorsiflexes foot at ankle • Extends 1st interphalangeal joint ```
73
Extensor digitorum | longus
• Extends 2nd-5th distal interphalangeal joints
74
Fibularis (peroneus) | tertius
• Dorsiflexes foot at ankle • Everts foot
75
Fibularis (peroneus) | longus
• Plantar flexes foot at ankle • Everts foot
76
Fibularis (peroneus) | brevis
• Plantar flexes foot at ankle • Everts foot
77
Gastrocnemius
Plantar flexes foot | at ankle
78
Soleus
• Plantar flexes foot | at ankle
79
Flexor digitorum longus •
``` • Plantar flexes foot at ankle • Inverts foot • Flexes 2nd-5th distal interphalangeal joints ```
80
Flexor hallucis longus
``` • Plantar flexes foot at ankle • Inverts foot • Flexes all joints of hallux ```
81
Tibialis posterior
• Plantar flexes foot at ankle • Inverts foot
82
Iliocostalis
• Extends vertebral column • Laterally flexes vertebral column
83
Longissimus •
• Extends vertebral column • Laterally flexes vertebral column
84
Spinalis •
• Extends vertebral | column
85
Splenius capitis
• Extends or hyperextends vertebral column
86
Semispinalis capitis
• Extends vertebral | column

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