Muscles that Act on the Glenohumeral Joint to Move the Arm

Question 1

latissimus dorsi - actions

Answer 1

extend, adduct, & medially rotate GH joint (“swimmer muscle”)

Question 2

latissimus dorsi - insertion

Answer 2

intertubercular groove of humerus

Question 3

latissimus dorsi - innervation

Answer 3

thoracodorsal nerve

Question 4

pectoralis major - action

Answer 4

arm flexion; adducts and medially rotates GH joint

Question 5

pectoralis major - insertion

Answer 5

intertubercular groove of humerus

Question 6

pectoralis major - innervation

Answer 6

lateral and medial pectoral nerves

Question 7

deltoid - actions

Answer 7

anterior fibers = flex and medially rotate GH joint
middle fibers = abduction GH joint
posterior fibers = extend and laterally rotate GH joint

Question 8

deltoid - insertion

Answer 8

deltoid tuberosity of humerus

Question 9

deltoid - innervation

Answer 9

axillary nerve

Question 10

coracobrachialis - action

Answer 10

adducts and flexes GH joint

Question 11

coracobrachialis - origin

Answer 11

coracoid process

Question 12

coracobrachialis - insertion

Answer 12

middle medial shaft of humerus

Question 13

coracobrachialis - innervation

Answer 13

musculocutaneous nerve

Question 14

teres major - action

Answer 14

extends, adducts, and medially rotates GH joint

Question 15

teres major - origin

Answer 15

inferior lateral border and inferior angle of scapula

Question 16

teres major - insertion

Answer 16

lesser tubercle and intertubercular groove of humerus

Question 17

teres major - innervation

Answer 17

lower subscapular nerve

Question 18

triceps brachii - action

Answer 18

extend GH joint

Question 19

triceps brachii - origin

Answer 19

infraglenoid tubercle

Question 20

triceps brachii - insertion

Answer 20

olecranon process

Question 21

triceps brachii - innervation

Answer 21

radial nerve

Question 22

biceps brachii - action

Answer 22

flexes GH joint

Question 23

biceps brachii - origin

Answer 23

supraglenoid tubercle

Question 24

biceps brachii - insertion

Answer 24

radial tuberosity and bicipital aponerurosis

Question 25

biceps brachii - innervation

Answer 25

musculocutaneous nerve

Question 26

subscapularis - action

Answer 26

(rotator cuff) medially rotates GH, stabilizes GH joint

Question 27

subscapularis - origin

Answer 27

subscapular fossa

Question 28

subscapularis - insertion

Answer 28

lesser tubercle of humerus

Question 29

subscapularis - innervation

Answer 29

upper and lower subscapular nerves

Question 30

supraspinatus - action

Answer 30

(rotator cuff) abducts GH joint, stabilizes GH joint

Question 31

supraspinatus - origin

Answer 31

supraspinous fossa

Question 32

supraspinatus - insertion

Answer 32

greater tubercle of humerus

Question 33

supraspinatus - innervation

Answer 33

suprascapular nerve

Question 34

infraspinatus - action

Answer 34

(rotator cuff) adducts and laterally rotates GH joint, stabilizes GHJ

Question 35

infraspinatus - origin

Answer 35

infraspinous fossa

Question 36

infraspinatus - insertion

Answer 36

greater tubercle of humerus

Question 37

infraspinatus - innervation

Answer 37

suprascapular nerve

Question 38

teres minor - action

Answer 38

(rotator cuff) adducts and laterally rotates GH joint, stabilizes GHJ

Question 39

teres minor - origin

Answer 39

superior lateral border of scapula

Question 40

teres minor - insertion

Answer 40

greater tubercle of humerus

Question 41

teres minor - innervation

Answer 41

axillary nerve

Question 42

supraspinatus and infraspinatus - blood supply

Answer 42

suprascapular artery

Question 43

triceps brachii - blood supply

Answer 43

deep brachial artery