Upper Extremity Actions

Question 1

Action of Trapezius

Answer 1

Upper: Elevation and upward rotation
Middle: Adduction and upward rotation
Lower: Upward rotation

Question 2

Action of Latissimus Dorsi

Answer 2

Adduction
Extension
Internal Rotation
Depression
Lateral Flexion (to same side)
Elevation of Pelvis
Contralateral rotation

Question 3

Action of Levator Scapulae

Answer 3

Downward rotation

Question 4

Action of Rhomboid Minor

Answer 4

Adduction
Slight Downward Rotation
Slight elevation

Question 5

Action of Rhomboid Major

Answer 5

Adduction
Slight elevation
Slight downward rotation

Question 6

Action of Deltoid

Answer 6

Anterior: flexion, abduction, internal rotation
Middle: abduction
Posterior: extension, abduction, external rotation

Question 7

Action of Teres Major

Answer 7

Internal rotation

Extension

Question 8

Action of Supraspinatous

Answer 8

Abduction (10-15 degrees before deltoid takes over)

Question 9

Action of Infraspinatous

Answer 9

External rotation

Question 10

Action of Teres Minor

Answer 10

?

Question 11

Action of Subscapularis

Answer 11

Slight adduction

Internal rotation

Question 12

Action of Pectoralis Major

Answer 12

Internal Rotation

Main function is Adduction

Question 13

Action of Pectoralis Minor

Answer 13

Protraction
Some downward rotation of scapula
Anterior tilt of scapula

Question 14

Action of Subclavius

Answer 14

?

Question 15

Action of Serratus Anterior

Answer 15

?

Question 16

Action of Sternocleidomastoid

Answer 16

Alone: tilts head to same side, rotates face to opposite side
Working together: flexes neck, raises sternum and assists in forced inspiration

Question 17

Action of Scalene

Answer 17

Elevation

Question 18

Action of Biceps Brachii

Answer 18

Powerful supinator of forearm
Powerful flexor of elbow joint
Weak flexor of shoulder joint

Question 19

Action of Coracobrachialis

Answer 19

Flexes arm
Adducts arm
Stabilizes glenohumeral joint

Question 20

Action of Brachialis

Answer 20

Flexion of elbow joint

Question 21

Action of Triceps Brachii

Answer 21

Chief extensor of forearm

Question 22

Action of Anconeous

Answer 22

Assists triceps in extending forearm

Stabilizes elbow joint

Question 23

Action of Supinator

Answer 23

Supinates forearm (ie rotates radius to turn palm anteriorly)

Question 24

Action of Pronator Teres

Answer 24

Pronates and flexes forearm (at elbow)

Question 25

Action of Pronator Quadratus

Answer 25

Pronates forearm | Deep fibers bind radius and ulna together

Question 26

Action of Palmaris Longus

Answer 26

Flexes hand at wrist | Tightens palmar aponeurosis

Question 27

Action of Flexor Carpi Radialis

Answer 27

Radial Flexion

Question 28

Action of Flexor Carpi Ulnaris

Answer 28

Wrist flexion

Question 29

Action of Flexor Digitorum Superficialis

Answer 29

Flexes middle phalanges at priximal interphalangeal joints of medial 4 digits Acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints and hand

Question 30

Action of Flexor Digitorum Profundus

Answer 30

Flexes distal phalanges at distal interphalangeal joints of medial 4 digits Assits in flexion of hand

Question 31

Action of Flexor Pollicis Longus

Answer 31

Flexes phalanges of 1st digit (thumb)

Question 32

Action of Abductor Pollicis Brevis

Answer 32

Flexes thumb

Question 33

Action of Brachioradialis

Answer 33

Flexes forearm

Question 34

Action of Extensor Carpi Radialis Brevis

Answer 34

Extend and abduct hand at wrist joint

Question 35

Extensor Carpi Radialis Longus

Answer 35

Extend hand at wrist joint | Abduct hand at wrist joint

Question 36

Action of Extensor Digitorum (all medial 4)

Answer 36

Extends medial four digits at metacarpophalangeal joints | Extends hand at wrist joint

Question 37

Action of Extensor Carpi Ulnaris

Answer 37

Extends and adducts hand at wrist joint

Question 38

Action of Extensor Digiti Minimi

Answer 38

Extends 5th digit at metacarpophalangeal and interphalangeal joints

Question 39

Action of Extensor Indices

Answer 39

Extends 2nd digit | Helps to extend hand

Question 40

Action of Extensor Pollicis Brevis

Answer 40

Extends proximal phalanx of thumb at carpometacarpal joint

Question 41

Action of Extensor Pollicis Longus

Answer 41

Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints

Question 42

Action of Abductor Pollicis Brevis

Answer 42

Abducts thumb and helps oppose it

Question 43

Action of Opponens Pollicis

Answer 43

Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially

Question 44

Action of Flexor Pollicis Brevis

Answer 44

Flexes thumb

Question 45

Action of Abductor Digiti Minimi

Answer 45

Abducts little (5th) finger

Question 46

Action of Flexor Digiti Minimi

Answer 46

Flexes proximal phalanx of little (5th) finger

Question 47

Action of Opponens Digit Minimi

Answer 47

Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb

Question 48

Action of Adductor Pollicis

Answer 48

Draws 1st metacarpal laterally to oppose thumb toward center of pam and rotates it medially

Question 49

Action of Interosseous Muscles (Palmar)

Answer 49

Palmar 1-3: Adducts digits toward axial line and assist lumbricals in flexing metcarpophalangeal joints and extending interphalanageal joints

Question 50

Action of Lumbricals

Answer 50

``` Finger flexion (metacarpophalangeals) Finger Extension (interphalangeal) ```

Question 51

Action of Interosseous Muscles (Dorsal)

Answer 51

Dorsal 1-4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints