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Medicine > Shoulder Anatomy 2 > Flashcards

Shoulder Anatomy 2 Flashcards

1
Q

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

A

2:1

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2
Q

what is the ideal length-tension relationship?

A

80-120

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3
Q

what is the purpose of the scapulohumeral rhythm?

A

promotes optimal length tension relationship

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4
Q

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

A

at the GH joint

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5
Q

where does the midrange of motion occur?

A

scapula

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6
Q

where does the latter part of motion occur?

A

GH joint

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7
Q

which 2 muscles contribute to elevation?

A

serratus anterior

trapezius

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8
Q

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

A

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

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9
Q

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

A

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

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10
Q

what is close-packed position?

A

most stable position (most congruence)

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11
Q

what is open chain?

A

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

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12
Q

what is closed chain?

A

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

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13
Q

what is an isometric contraction?

A

tension develops and there is not movement

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14
Q

what is an isotonic contraction?

A

tension overcomes load and movement occurs

  • concentric-shortening
  • eccentric-lengthening
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15
Q

what are the origin/insertion of deltoid?

A

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

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16
Q

how is deltoid innervated?

A

axillary nerve

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17
Q

what are the O/I of supraspinatus?

A

O: suprapsinous fossa
I: greater tubercle

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18
Q

how is supraspinatous innervated?

A

suprascapular nerve

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19
Q

what are the O/I of infraspinatous?

A

O: infraspinous fossa
I: greater tubercle

20
Q

how is the infraspinatous innervated?

A

suprascapular nerve

21
Q

what are the O/I of teres minor?

A

O: upper lateral border of scapula
I: greater tubercle

22
Q

how is the teres minor innervated?

A

axillary nerve

23
Q

what are the O/I of subscapularis?

A

O: subscapular fossa
I: lesser tubercle

24
Q

how is the subscapularis innervated?

A

subscapular nerve

25
Q

which 2 muscle cause external rotation?

A

infraspinatous

teres minor

26
Q

which muscle causes internal rotation?

A

subscapularis

27
Q

what are the O/I of trapezius?

A

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

28
Q

how is trapezius innervated?

A

CN XI and C3, C4

29
Q

what is function of middle trapezius?

A

scapular elevation and adduction

30
Q

what is function of rhomboids?

A

scapular elevation and adduction

31
Q

what are the O/I of rhomboids?

A

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

32
Q

how are rhomboids innervated?

A

dorsal scapular nerve

33
Q

what are the O/I of serratus anterior?

A

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

34
Q

how is serratus anterior innervated?

A

long thoracic nerve

35
Q

what are the O/I of lats?

A

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
Q

how are the lats innervated?

A

thoracodorsal nerve

37
Q

what are the O/I of pec major?

A

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

38
Q

how is pec major innervated?

A

lateral and medial pectoral nerves

39
Q

what are the O/I of pec minor?

A

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

40
Q

how is pec major innervated?

A

medial and lateral pectoral nerves

41
Q

which muscle groups impact action of teres major?

A

rhomboids

42
Q

what are the O/I of teres major?

A

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

43
Q

how is teres major innervated?

A

lower subscapular nerve

44
Q

what is the role of biceps in shoulder functin?

A

forward flexion

45
Q

what are the O/I of biceps brachi

A

O: long head from tubercle above glenoid cavity

I; radial tuberosity

46
Q

how is biceps brachi innervated?

A

musculocutaneous

Medicine (146 decks)

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