Shoulder Anatomy 2 Flashcards Preview

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Flashcards in Shoulder Anatomy 2 Deck (46):
1

what is the ratio of movement between GH and scapulothoracic motion?

2:1

2

what is the ideal length-tension relationship?

80-120

3

what is the purpose of the scapulohumeral rhythm?

promotes optimal length tension relationship

4

where does the initial 60 degrees of flexion or 30 degrees of abduction occur?

at the GH joint

5

where does the midrange of motion occur?

scapula

6

where does the latter part of motion occur?

GH joint

7

which 2 muscles contribute to elevation?

serratus anterior
trapezius

8

what do you have after the 1st phase of motion?

30 degrees scapular
60 degrees GH
SC joint has to be working

9

what do you have after the 2nd phase of motion?

30 degrees scapular
60 degrees Gh
rotation of clavicle happens at the AC joint

10

what is close-packed position?

most stable position (most congruence)

11

what is open chain?

when the ends of the limbs are free to move without causing motion at another joint

12

what is closed chain?

when motion at one joint will produce motion at all the others in the chain

13

what is an isometric contraction?

tension develops and there is not movement

14

what is an isotonic contraction?

tension overcomes load and movement occurs
-concentric-shortening
-eccentric-lengthening

15

what are the origin/insertion of deltoid?

O:acromial end of clavicle/acromion/spine of scapula
I: deltoid tuberosity

16

how is deltoid innervated?

axillary nerve

17

what are the O/I of supraspinatus?

O: suprapsinous fossa
I: greater tubercle

18

how is supraspinatous innervated?

suprascapular nerve

19

what are the O/I of infraspinatous?

O: infraspinous fossa
I: greater tubercle

20

how is the infraspinatous innervated?

suprascapular nerve

21

what are the O/I of teres minor?

O: upper lateral border of scapula
I: greater tubercle

22

how is the teres minor innervated?

axillary nerve

23

what are the O/I of subscapularis?

O: subscapular fossa
I: lesser tubercle

24

how is the subscapularis innervated?

subscapular nerve

25

which 2 muscle cause external rotation?

infraspinatous
teres minor

26

which muscle causes internal rotation?

subscapularis

27

what are the O/I of trapezius?

O: occipital bone, ligamentum nuchae, C7 and all thoracic vertebrae
I: acromion and spine of scapula and lateral third of clavicle

28

how is trapezius innervated?

CN XI and C3, C4

29

what is function of middle trapezius?

scapular elevation and adduction

30

what is function of rhomboids?

scapular elevation and adduction

31

what are the O/I of rhomboids?

O: spinous process C7-T5
I: medial border of scapula

32

how are rhomboids innervated?

dorsal scapular nerve

33

what are the O/I of serratus anterior?

O: ribs 1-8
I: entire anterior surface of vertebral border of scapula

34

how is serratus anterior innervated?

long thoracic nerve

35

what are the O/I of lats?

O: lumbodorsal fascia into spines of lower 6 thoracic vertebrae, L vertebrae, lower 3 ribs and iliac crest.
I: floor of intertubercular groove of humerus

36

how are the lats innervated?

thoracodorsal nerve

37

what are the O/I of pec major?

O: sternal end of clavicle, sternum, ribs 1-7, aponeurosis of external oblique
I: intertubercular groove of humerus

38

how is pec major innervated?

lateral and medial pectoral nerves

39

what are the O/I of pec minor?

O: ant. surface of ribs 3-5
I: coracoid process of scapula

40

how is pec major innervated?

medial and lateral pectoral nerves

41

which muscle groups impact action of teres major?

rhomboids

42

what are the O/I of teres major?

O: post. surface of scapula near inferior angle
I: intertubercular groove of humerus/fused with lats

43

how is teres major innervated?

lower subscapular nerve

44

what is the role of biceps in shoulder functin?

forward flexion

45

what are the O/I of biceps brachi

O: long head from tubercle above glenoid cavity
I; radial tuberosity

46

how is biceps brachi innervated?

musculocutaneous

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