ch 10- shoulder joint muscles

Question 1

superficial muscle that covers the shoulder joint on the three sides giving the shoulder a round shape; triangular shaped; divided into anterior, middle, and posterior

Answer 1

deltoid

Question 2

spans the joint on anterior surface at an oblique angle

Answer 2

anterior deltoid

Question 3

when arm is at shoulder level, the line of pull of the anterior deltoid changes to

Answer 3

horizontal

Question 4

O- lateral third of clavicle

Answer 4

anterior deltoid

Question 5

I- deltoid tuberosity

Answer 5

anterior deltoid

Question 6

A- shoulder abduction, flexion, medial rotation, ad horizontal adduction

Answer 6

anterior deltoid

Question 7

N- axillary nerve (C5, C6)

Answer 7

anterior deltoid

Question 8

vertical line of pull lateral to joint axis

Answer 8

middle deltoid

Question 9

O- acromion process

Answer 9

middle deltoid

Question 10

I- deltoid tuberosity

Answer 10

middle deltoid

Question 11

A- shoulder abduction

Answer 11

middle deltoid

Question 12

N- axillary nerve (C5-6)

Answer 12

middle deltoid

Question 13

oblique line of pull posterior to joint axis

Answer 13

posterior deltoid

Question 14

when arm is at shoulder level, the line of pull of posterior deltoid changes to

Answer 14

posterior deltoid

Question 15

O- spine of scapula

Answer 15

posterior deltoid

Question 16

I- deltoid tuberosity

Answer 16

posterior deltoid

Question 17

A- shoulder abduction, extension, hyperextension, lateral rotation, and horizontal abduction

Answer 17

posterior deltoid

Question 18

N- axillary nerve (C5, C6)

Answer 18

posterior deltoid

Question 19

large muscle of chest; superficial except for its distal attachment lying under deltoid muscle

Answer 19

pectoralis major

Question 20

crosses joint on anterior surface in horizontal direction, creating medial pull on humerus

Answer 20

pectoralis major

Question 21

O- medial third of clavicle, sternum, and costal cartilage of ribs 1-6

Answer 21

pectoralis major

Question 22

I- lateral lip of bicipital groove of humerus

Answer 22

pectoralis major

Question 23

A- shoulder adduction, medial rotation, and horizontal adduction

Answer 23

pectoralis major

Question 24

N- lateral and medial pectoral (C5-T1)

Answer 24

pectoralis major

Question 25

more vertical line of pull when shoulder is extended and when at shoulder level, it becomes a horizontal line of pull

Answer 25

pectoralis major- clavicular portion

Question 26

O- medial third of clavicle

Answer 26

pectoralis major- clavicular portion

Question 27

I- lateral lip of bicipital groove of humerus (inferior to sternal portion)

Answer 27

pectoralis major- clavicular portion

Question 28

A- shoulder flexion (first 60 degrees)

Answer 28

pectoralis major- clavicular portion

Question 29

Vertical line of pull when shoulder is in full flexion and loses effectiveness at midrange extension

Answer 29

pectoralis major- sternal portion

Question 30

O- sternum, costal cartilage of ribs 1-6

Answer 30

pectoralis major- sternal portion

Question 31

I- lateral lip of bicipital groove of humerus (superior to clavicular portion)

Answer 31

pectoralis major- sternal portion

Question 32

A- shoulder extension (first 60 degrees- from 180 to 120)

Answer 32

pectoralis major- sternal portion

Question 33

pectoralis major is an antagonist in which motions?

Answer 33

flexion and extension

Question 34

pectoralis major is an agonist in which motions?

Answer 34

shoulder adduction, medial rotation, and horizontal adduction

Question 35

broad, sheetlike muscle located on back; crosses the shoulder joint inferior and medial to joint axis

Answer 35

latissimus dorsi

Question 36

mostly superficial except for small portion covered posteriorly by lower trapezius and covered distally as it passes through the axilla to attach on floor of bicipital groove just anterior to the insertion of teres major; groove is on proximal, anterior surface of the humerus

Answer 36

latissimus dorsi

Question 37

O- spinous processes of T7-L5 (thoracolumbar fascia), posterior surface of sacrum, iliac crest, and lower three ribs

Answer 37

latissimus dorsi

Question 38

I- medial floor of bicipital groove of humerus

Answer 38

latissimus dorsi

Question 39

A- shoulder extension, adduction, medial rotation, hyperextension

Answer 39

latissimus dorsi

Question 40

N- thoracodorsal nerve (C6-8)

Answer 40

latissimus dorsi

Question 41

superficial muscle; "little helper" of latissimus dorsi muscle

Answer 41

teres major

Question 42

O- inferior axillary border of scapula near the inferior angle

Answer 42

teres major

Question 43

I- medial lip of bicipital groove on anterior surface of humerus

Answer 43

teres major

Question 44

A- shoulder extension, adduction, and medial rotatin

Answer 44

teres major

Question 45

N- lower subscapular nerve (C5-7)

Answer 45

teres major

Question 46

crosses superior aspect of shoulder joint; important in stabilizing the head of humerus against the glenoid fossa

Answer 46

supraspinatus

Question 47

horizontal line of pull which pulls head of humerus into glenoid fossa

Answer 47

supraspinatus

Question 48

O- supraspinous fossa of scapula

Answer 48

supraspinatus

Question 49

I- greater tubercle of humerus

Answer 49

supraspinatus

Question 50

A- shoulder abduction

Answer 50

supraspinatus

Question 51

N- suprascapular nerve (C5, 6)

Answer 51

supraspinatus

Question 52

superficial but portions covered by trapezius and deltoid; horizontal line of pull passing posterior to joint; important role in stabilizing the head of the humerus against the glenoid fossa

Answer 52

infraspinatus

Question 53

O- infraspinous fossa of scapula

Answer 53

infraspinatus

Question 54

I- greater tubercle of humerus

Answer 54

infraspinatus

Question 55

A- shoulder lateral rotation, horizontal abduction

Answer 55

infraspinatus

Question 56

N- suprascapular nerve (C5,6)

Answer 56

infraspinatus

Question 57

run obliquely up and outward to attach to humerus; important role in stabilizing the head of humerus against glenoid fossa

Answer 57

teres minor

Question 58

O- axillary border of scapula

Answer 58

teres minor

Question 59

I- greater tubercle of humerus

Answer 59

teres minor

Question 60

A- shoulder lateral rotation, horizontal abduction

Answer 60

teres minor

Question 61

N- axillary nerve (C5,6)

Answer 61

teres minor

Question 62

supraspinatus, infraspinatus, teres minor, subscapularis

Answer 62

rotator cuff muscles

Question 63

deep in underside (anterior) of scapula lying next to rib cage; horizontal line of pull on anterior side of joint

Answer 63

subscapularis

Question 64

O- subscapular fossa of scapula

Answer 64

subscapularis

Question 65

I- lesser tubercle of humerus

Answer 65

subscapularis

Question 66

A- shoulder medial rotation

Answer 66

subscapularis

Question 67

N- upper and lower subscapular nerve (C5, 6)

Answer 67

subscapularis

Question 68

vertical line of pull close to joint axis; most force generated directly back into joint, stabilizing the head against glenoid fossa

Answer 68

coracobrachialis

Question 69

O- coracoid process of scapula

Answer 69

coracobrachialis

Question 70

I- medial surface of humerus near the midpoint

Answer 70

coracobrachialis

Question 71

A- stabilizes the shoulder joint

Answer 71

coracobrachialis

Question 72

N- musculocutaneous nerve (C5-7)

Answer 72

coracobrachialis

Question 73

flex joint because it crosses anteriorly; assistive to shoulder joint

Answer 73

biceps

Question 74

two joint muscle crossing the shoulder and elbow

Answer 74

biceps

Question 75

O- two heads on scapula (supraglenoid tubercle and coracoid process)

Answer 75

biceps

Question 76

I-radius (radial tuberosity)

Answer 76

biceps

Question 77

3 heads but only long head crosses shoulder joint

Answer 77

triceps

Question 78

assistive in shoulder joint; crosses posteriorly to extend joint

Answer 78

triceps (long head)

Question 79

O- scapula (infraglenoid tubercle)

Answer 79

triceps (long head)

Question 80

I- ulna (olecranon process)

Answer 80

triceps (long head)