Upper Extremities I and II: Muscle Actions

Question 1

Trapezius

Answer 1

Scapula:
+ elevate
+ retract
+ glendoid-up rotate

Question 2

Latissimus dorsi

Answer 2

Humerus:
+ adduct
+ medially rotate
+ extend

Question 3

Levator scapula

Answer 3

Scapula:
+ elevate
+ glenoid-down rotate

Question 4

Rhomboid minor

Answer 4

Scapula:
+ elevate
+ retract
+ glenoid-down rotate

Question 5

Rhomboid major

Answer 5

Scapula:
+ elevate
+ retract
+ glenoid-down rotate

Question 6

Deltoid

Answer 6

Humerus:
+ (clavicular) flex and medially rotate
+ (acromial) abduct
+ (spinous) extend and laterally rotate

Question 7

Subscapularis

Answer 7

Humerus:
+ medially rotate
+ stabilize glenohumeral joint

Question 8

Supraspinatus

Answer 8

Humerus:
+ initiate abduction
+ stabilize glenohumeral joint

Question 9

Infraspinatus

Answer 9

Humerus:
+ laterally rotate
+ stabilize glenohumeral joint

Question 10

Teres minor

Answer 10

Humerus:
+ laterally rotate
+ stablize glenohumeral joint

Question 11

Teres major

Answer 11

Humerus:
+ adduct
+ medially rotate

Question 12

Triceps brachii

Answer 12

Humerus:

+ extend

Question 13

Brachioradialis

Answer 13

Forearm:

+ flex

Question 14

Extensor carpi radialis longus

Answer 14

Wrist:
+ abduct
+ extend

Question 15

Extensor carpi radialis brevis

Answer 15

Wrist:
+ abduct
+ extend

Question 16

Extensor digitorum

Answer 16

MCP and IP joints:

+ extend

Question 17

Extensor digiti minimi

Answer 17

MCP and IP joints of digit 5:

+ extend

Question 18

Extensor carpi ulnaris

Answer 18

Wrist:
+ adduct
+ extend

Question 19

Supinator

Answer 19

Forearm:

+ Supi-/pronation

Question 20

Extensor indices

Answer 20

MCP and IP joints of digit 2:

+ extend

Question 21

Abductor pollicis longus

Answer 21

CMC of digit 1:
+ abduct
+ extend

Question 22

Extensor pollicis brevis

Answer 22

MCP of digit 1:

+ extend

Question 23

Extensor pollicis longus

Answer 23

IP of digit 1:

+ extend