Back + Arm + Hand muscles

Question 1

biceps brachii (short head) action? origin and insertion?

Answer 1

action = flexion and supination of the forearm
origin = scapula
insertion = radial tuberostiy of radius

Question 2

biceps brachii (long head) action? origin and insertion?

Answer 2

action = flexion and supination of the forearm
origin = scapula
insertion = radial tuberostiy of radius

Question 3

coracobrachialis action? origin and insertion?

Answer 3

action = flexion and adduction of the arm
origin = coracoid process of scapula
insertion = humerus

Question 4

deltoid action? origin and insertion?

Answer 4

action = abduction of the arm
origin = acromial end of clavicle and acromion and spine of scapula
insertion = deltoid tuberosity of humerus

Question 5

infraspinatus action? origin and insertion?

Answer 5

action = lateral rotation of the arm
origin = infraspinous fossa of scapula
insertion = greater tubercle of humerus

Question 6

latissimus dorsi action?

Answer 6

extension, adduction, and medial rotation of the arm

Question 7

subclavius action? origin and insertion?

Answer 7

action = depresses the clavicle
origin = 1st rib
insertion = clavicle

Question 8

subscapularis action? origin and insertion?

Answer 8

action = medial rotation of arm
origin = subscapular fossa of scapula
insertion = lesser tubercle of humerus

Question 9

supraspinatus action? origin and insertion?

Answer 9

action = abduction of arm
origin = supraspinous fossa of scapula
insertion = greater tubercle of humerus

Question 10

teres major action? origin and insertion?

Answer 10

action = extension, adduction, and medial rotation of arm
origin = scapula
insertion = humerus

Question 11

teres minor action? origin and insertion?

Answer 11

action = adduction and lateral rotation of arm
origin = scapula
insertion = humerus

Question 12

trapezius action? origin and insertion?

Answer 12

action = elevate, depress, and retract scapula
origin = occipital bone and spinous processes (c7 - t12)
insertion = clavicle, acromion process and spine of scapula

Question 13

triceps brachii (long head ) action? origin and insertion?

Answer 13

action = extension of forearm
origin = scapula
insertion = olecranon of ulna

Question 14

triceps brachii (lateral head) action? origin and insertion?

Answer 14

action = extension of forearm
origin = humerus
insertion = olecranon of ulna

Question 15

triceps brachii (medial head) action? origin and insertion?

Answer 15

action = extension of forearm
origin = humerus
insertion = olecranon of ulna

Question 16

erector spinae action?

Answer 16

extends and laterally flexes vertebral column

Question 17

rhomboid major action? origin and insertion?

Answer 17

action = elevate and retract scapula
origin = spinous process of vertebrae
insertion = medial border of scapula

Question 18

rhomboid minor action? origin and insertion?

Answer 18

action = elevate and retract scapula
origin = spinous process of vertebrae
insertion = medial border of scapula

Question 19

semispinalis capitis action?

Answer 19

extends and laterally flexes vertebral column

Question 20

serratus posterior action?

Answer 20

elevates and depresses ribs during forced inspiration/expiration

Question 21

anconeus action?

Answer 21

extension of the forearm

Question 22

brachialis action? origin and insertion?

Answer 22

action = flexion of the forearm
origin = humerus
insertion = styloid process of radius

Question 23

extensor carpi radialis brevis action? origin?

Answer 23

action = extends wrist and abducts hand
origin = humerus

Question 24

extensor carpi radialis longus action? origin?

Answer 24

action = extends wrist and abducts hand
origin = humerus

Question 25

extensor carpis ulnaris action? origin?

Answer 25

action = extends wrist and adducts hand
origin = humerus

Question 26

extensor digiti minimi action? origin?

Answer 26

action = extends digit 5 (pinky)
origin = humerus

Question 27

extensor digitorum of hand action? origin?

Answer 27

action = extends wrist and digits 2-5
origin = humerus

Question 28

flexor carpi radialis action?

Answer 28

flexes wrist and abducts hand

Question 29

flexor carpi ulnaris action?

Answer 29

flexes wrist and adducts hand

Question 30

flexor digitorum profundus action?

Answer 30

flexes wrist and digits 2-5

Question 31

flexor digitorum superficialis action?

Answer 31

flexes wrist and digits 2-5

Question 32

palmaris longus action?

Answer 32

flexes wrist

Question 33

pronator quadratus action?

Answer 33

pronates forearm

Question 34

pronator teres action?

Answer 34

pronates forearm

Question 35

abductor digit minimi of hand action?

Answer 35

abducts digit 5 (pinky)

Question 36

abductor pollicis brevis action?

Answer 36

abducts digit 1 (thumb)

Question 37

adductor pollicis action?

Answer 37

adducts digit 1 (thumb)

Question 38

dorsal interosseous of hand action?

Answer 38

abducts digits 2-5

Question 39

extensor pollicis brevis action?

Answer 39

extends digit 1 (thumb)

Question 40

flexor pollicis brevis action?

Answer 40

flexes digit 1 (thumb)