Shoulder

Question 1

Origin of pec major

Answer 1

medial clavicle
sternum
cartilage of ribs 1 - 6

Question 2

insertion of pec major

Answer 2

crest of greater tubercle of humerus

Question 3

action of pec major

Answer 3

all fibers

• adduct and IR shoulder
• assist to elevate thoracic during forced inhalation

upper fibers
- flex and horizontally adduct the shoulder

lower fibers - extend the shoulder

Question 4

innervation of pec major

Answer 4

upper fibers
- lateral pec nerve C5, 6, 7

lower fibers
- lateral and medial pectoral nerve C6, 7, 8, T1 (C6 - T1)

Question 5

origin of pec minor

Answer 5

ribs 3 - 5

Question 6

insertion of pec minor

Answer 6

medial surface of coracoid process of the scap

Question 7

action of pec minor

Answer 7

depress, adduct and downwardly rotate scap

with scap fixed - assist to elevate thorax during forced inhalation

Question 8

innervation of pec minor

Answer 8

medial pectoral nerve
lateral pectoral nerve
C6, 7, 8 T1 (C6 - T1)

Question 9

origin of subclavius

Answer 9

1st rib and cartilage

Question 10

insertion of subclavius

Answer 10

inferior surface of clavicle

Question 11

action of subclavius

Answer 11

1. depress the clavicle and draw it anteriorly
2. elevate the first rib
3. stabilizes the sternoclavicular joint

Question 12

innervation of subclavius

Answer 12

subclavian nerve C5, 6

Question 13

origin of serratus anterior

Answer 13

external surfaces of ribs 1 - 9

Question 14

insertion of serratus anterior

Answer 14

anterior surface of medial border of the scapula

Question 15

action of serratus anterior

Answer 15

with origin fixed

1. abduct, upwardly rotate and depress the scapula
2. hold medial border of the scapula against rib cage

with scap fixed - act to elevate thorax during forced inhalation

Question 16

innervation of serratus anterior

Answer 16

long thoracic nerve C5, 6, 7, 8

Question 17

origin of deltoid

Answer 17

anterior = lateral clavicle
middle = acromion
posterior = spine of scap

Question 18

insertion of deltoid

Answer 18

deltoid tuberosity

Question 19

action of deltoid

Answer 19

all fibers = abduct shoulder

anterior fibers = flex, medially rotate and horizontally adduct shoulder

posterior fibers = extend, laterally rotate and horizontally abduct shoulder

Question 20

innervation of deltoid

Answer 20

axillary nerve C5, 6

Question 21

origin of teres major

Answer 21

inferior angle and lateral border of the scapula

Question 22

insertion of teres major

Answer 22

crest of lesser tubercle of the humerus

Question 23

action of teres major

Answer 23

extend, adduct and IR the shoulder

Question 24

innervation of teres major

Answer 24

lower subscap nerve C5, 6, 7

Question 25

origin of subscapularis

Answer 25

subscapular fossa of scap

Question 26

insertion of subscap

Answer 26

lesser tubercle of the humerus

Question 27

action of subscap

Answer 27

IR shoulder

stabilize head of humerus in glenoid

Question 28

innervation of subscap

Answer 28

upper and lower subscap C5, 6, 7

Question 29

origin of supraspinatus

Answer 29

supraspinous fossa of the scap

Question 30

insertion of supraspinatus

Answer 30

greater tubercle of the humerus

Question 31

action of supraspinatus

Answer 31

abduct shoulder

stabilize head of humerus in glenoid

Question 32

innervation of supraspinatus

Answer 32

suprascapular nerve C 4, 5, 6

Question 33

origin of infraspinatus

Answer 33

infraspinous fossa of the scap

Question 34

insertion of infraspinatus

Answer 34

greater tubercle of the humerus

Question 35

action of infraspinatus

Answer 35

laterally rotate and adduct the shoulder

stabilize head of humerus in glenoid cavity

Question 36

innervation of infraspinatus

Answer 36

suprascapular nerve C4, 5, 6

Question 37

origin of teres minor

Answer 37

lateral border of the scap

Question 38

insertion of teres minor

Answer 38

greater tubercle of the humerus

Question 39

action of teres minor

Answer 39

laterally rotate and adduct shoulder

stabilize head of humerus in glenoid cavity

Question 40

innervation of teres minor

Answer 40

axillary nerve C5, 6