Muscle Actions

Question 1

Coracobrachialis

Answer 1

Flexion and adduction of shoulder joint

Question 2

Levator Scapulae

Answer 2

origin fixed: Elevates scapula
insertion fixed: Lat flexes cervical vertebrae and rotates bilaterally: may assist in extension

Question 3

Latissimus Dorsi

Answer 3

extension, adduction, medial rotations of shoulder

Question 4

Lower Trapezius

Answer 4

Scapular adduction, depression, + upward rotation

Question 5

Middle Trapezius

Answer 5

Scapular Adduction

Question 6

Upper Trapezius

Answer 6

Elevation of scapula + shoulder, capital ext, rotation of head to opposite side

Question 7

Pectoralis Minor

Answer 7

Scapular Protraction, elevation of ribs in forced inspiration w/ scapula fixed by elevator scapula

Question 8

Pectoralis Major

Answer 8

Whole: Adducts and medially rotates humerus, elevation of sternum in forced inspiration

Question 9

Pectoralis Major (Clavicle)

Answer 9

Horizontal shoulder adduction, flexion and medial rotation

Question 10

Pectoralis Major (Stern)

Answer 10

horizontal shoulder adduction, shoulder extension

Question 11

Teres Major

Answer 11

Medially rotates, adducts and extends the shoulder joint

Question 12

Subscapularis

Answer 12

Medially rotates the shoulder joint, + stabilizes the head of the humerus in the glenoid cavity during movements of the joint

Question 13

Supraspinatus

Answer 13

Abducts the shoulder joint and stabilizes the head of the humerus in the glenoid cavity

Question 14

Infraspinatus

Answer 14

Stabilize and externally rotate

Question 15

Teres Minor

Answer 15

Laterally rotates the shoulder joint and stabilizes the head of the humerus in the glenoid cavity

Question 16

Rhomboid Major

Answer 16

Scapular retraction

Question 17

Rhomboid Minor

Answer 17

Scapular retraction and elevation

Question 18

Serratus Anterior

Answer 18

Scapular abduction, holds scapula against thoracic wall, works w/ trap to rotate scapula upward

Question 19

Deltoid

Answer 19

Abduction of shoulder

Question 20

Middle Deltoid

Answer 20

Abduction of the shoulder joint, performed chiefly by the middle fibers w/ stabilization by the ant. and post. fibers

Question 21

Triceps

Answer 21

Shoulder(long head) and elbow extension

Question 22

Biceps

Answer 22

Supinates forearm when elbow is flexed

Question 23

Scalenes

Answer 23

Cx flexion, lateral flexion same side, aides inspiration

Question 24

Transverse Abdominus

Answer 24

Supports abdominal wall, aides forced expiration and raising intra abdominal pressure

Question 25

Sternocleidomastoid

Answer 25

(unilateral) Lateral flex head to same side, rotates head to opposite side; bilaterally extends head

Question 26

Internal oblique

Answer 26

Lateral flexion and rotate same side, bilaterally flexes, abdominal bracing

Question 27

External oblique

Answer 27

rotate and side bend trunk

Question 28

Rectus abdominis

Answer 28

Flexes trunk, aids forced expiration and raise intra-abdominal pressure

Question 29

Intercostalis

Answer 29

extension of spine

Question 30

Longissimus

Answer 30

spine extension

Question 31

Spinalis

Answer 31

spine extension

Question 32

Quadratus Lumborum

Answer 32

Hip hiker, lateral bend same side, bilateral help w/ bearing down

Question 33

Anconeus

Answer 33

Assists triceps with elbow extension

Question 34

Opponens pollicis

Answer 34

opposition of thumb

Question 35

Palmar interossei

Answer 35

adduct digits 1,2,4,5 towards digit 3

Question 36

Dorsal interossei

Answer 36

abducts fingers around digit 3 (DAB) assist to flex MCP while extending IPs

Question 37

Lumbricals

Answer 37

Flex MCPs w/ IPs extended

Question 38

Pronator Teres

Answer 38

Pronation of forearm, assist w/ elbow flexion

Question 39

Pronator quadratus

Answer 39

Pronation of forearm

Question 40

Supinator

Answer 40

Supination

Question 41

Extensor digiti minimi

Answer 41

extension of 5th digit @ MCP, PIP, DIP joints assists wrist extension and abduction of 5th digit

Question 42

extensor digitorum

Answer 42

extends MCP, PIP, DIP joints of digits 2-5, assists wrist extension, IP extension in conjunction with hand intrinsics (2-5)

Question 43

Brachioradialis

Answer 43

elbow flexion with the forearm in neutral

Question 44

Brachialis

Answer 44

Flexes forearm in all position

Question 45

Flexor carpi radialis

Answer 45

flexion and radial deviation (abduction) of wrist

Question 46

Palmaris longus

Answer 46

Tenses palmar aponeurosis, assists wrist flexion (cups hand)

Question 47

Extensor pollicis brevis

Answer 47

Extends MCP joint of thumb and extension and abduction of CMs joint of thumb, assists w/ radial deviation and wrist extension

Question 48

Extensor indicis

Answer 48

Extension of 2nd finger @ MCP, IP extension in conjunction with hand intrinsics of index finger, wrist extension

Question 49

Abductor pollicis longus

Answer 49

Extension and abduction of thumb @ CMC joint: radial deviation

Question 50

Extensor pollicis longus

Answer 50

Extension of thumb at IP joint, assist with CMC and MP extensions and radial deviation

Question 51

Extensor Carpi radialis longus

Answer 51

Extend and radially deviate wrist, assist elbow flexion

Question 52

Abductor pollicis brevis

Answer 52

Abduction @ CMC and MCP joints of thumb assist with thumb opposition and IP extension

Question 53

Adductor Pollicis

Answer 53

adduction of CMC,, joint of thumb, assists thumb, MCP adduction and flexion

Question 54

Flexor pollicis brevis

Answer 54

Flexion of MP and CMC joints; thumb opposition

Question 55

Flexor digiti minimi

Answer 55

Flex MCP joint, assists opposition

Question 56

Abductor digiti minimi

Answer 56

abduction of 5th digit, opposition of 5th digit, MCP flexion and IP extension

Question 57

Opponens digiti minimi

Answer 57

Opposition of pinky to thumb

Question 58

Flexor carpi ulnaris

Answer 58

Flexes wrist and ulnarly deviates wrist

Question 59

Flexor digitorum superficialis

Answer 59

Flexion of PIP joints 2-5, flexion of MCP joints 2-5 and wrist flexion

Question 60

Flexor pollicis longus

Answer 60

Flexion of IP joint of thumb, assists with flexion of MCP and CMC joints of thumb, wrist flexion

Question 61

Extensor carpi ulnaris

Answer 61

Extend and ulnar deviation of wrist

Question 62

Extensor Carpi radialis brevis

Answer 62

Extend wrist and assist with radial deviation

Question 63

Flexor digitorum profundus

Answer 63

Flexion of DIP joints of digits 2-5 and flexion of MCP and PIP joints of digits 2-5 and wrist flexion