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anatomy > Shoulder Complex > Flashcards

Shoulder Complex Flashcards

1
Q

Synovial classification of sternoclavicular joint

A

sellar/saddle

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2
Q

Synovial classification of acromioclavicular joint

A

planar/gliding

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3
Q

Synovial classfication of glenohumeral joint

A

ball & socket

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4
Q

Synovial classification of scapulothoracic joint

A

pseudo-joint but necessary for full GH function

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5
Q

SC joint
Clavicle is ___________ superior-inferior & Manubrium is ___________ superior - inferior

A

convex
concave

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6
Q

SC joint
Clavicle is ________ anterior-posterior & manubrium is _________ anterior-posterior

A

concave
convex

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7
Q

Clavicle rolls & glides __________ during protraction of SC joint

A

anteriorly

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8
Q

Clavicle rolls & glides ____________ during retraction of SC joint

A

posteriorly

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9
Q

Clavicle rolls ______________ & glides _________ during elevation of SC joint

A

superiorly
inferiorly

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10
Q

Clavicle rolls __________ & glides _______ during depression of SC joint

A

inferiorly
superiorly

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11
Q

What direction does the AC joint glide during protraction & retraction of scapula?

A

anterior to posterior

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12
Q

Loose/open packed position of GH joint

A

55 deg abduction
30 deg horizontal adduction

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13
Q

Close packed position of GH joint

A

end range abduction and external rotation

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14
Q

During external rotation the GH joint rolls ____ and glides _____

A

posterior
anterior

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15
Q

During internal rotation the GH joint rolls _____ and glides _____

A

anterior
posterior

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16
Q

During flexion the GH joint rolls ____ and glides _____

A

superior
inferior

17
Q

Shoulder flexion
Primary and secondary mover, and antagonist

A

Primary: Anterior deltoid
Secondary: Biceps brachii
Antagonist: Latissimus dorsi

18
Q

Shoulder abduction
Primary and secondary mover, and antagonist

A

Primary: Middle deltoid
Secondary: supraspinatus
Antagonist: Pectoralis major

19
Q

Shoulder adduction
Primary and secondary mover, and antagonist

A

Primary: latissimus dorsi
Secondary: teres minor
Antagonist: Middle deltoid

20
Q

Shoulder internal rotation
Primary and secondary mover, and antagonist

A

Primary: subscapularis
Secondary: teres major
Antagonist: infraspinatus

21
Q

Shoulder extension
Primary and secondary mover, and antagonist

A

Primary: posterior deltoid
Secondary: teres major
Antagonist: anterior deltoid

22
Q

Shoulder external rotation
Primary and secondary mover, and antagonist

A

Primary: infraspinatus
Secondary: teres minor
Anatagonist: subscapularis

23
Q

Scapular elevation
Primary and secondary mover, and antagonist

A

Primary: upper trapezius
Secondary: levator scapulae
Anatagonist: lower trapezius

24
Q

Scapular depression
Primary and secondary mover, and antagonist

A

Primary: lower trapezius
Secondary: pectoralis minor
Antagonist: upper trapezius

25
Q

Scapular protraction
Primary and secondary mover, and antagonist

A

Primary: serratus anterior
Secondary: pectoralis major
Antagonist: Middle trapezius

26
Q

Scapular retraction
Primary and secondary mover, and antagonist

A

Primary: middle trapezius
Secondary: rhomboids
Antagonist: serratus anterior

27
Q

Scapular upward rotation
Primary and secondary mover, and antagonist

A

Primary: serratus anterior
Secondary: upper/lower trapezius
Antagonist: latissimus dorsi

28
Q

What does the articular disc in the sternoclavicular joint do?

A

Divides the joint in 2 to increase surface area, mobility, and shock absorption

29
Q

What are the 3 purposes of scapulohumeral rhythm?

A
  1. allows for greater overall shoulder ROM
  2. maintains optimal contact between humeral head and glenoid fossa
  3. assists with maintaining an optimal length-tension relationship of the glenohumeral muscles (for stability)
30
Q

Why does the glenohumeral joint have the greatest ROM?

A

shallow joint, extensive joint capsule, limited ligamentous support

31
Q

What are the static stabilizers of the GH joint?

A

Labrum, ligaments, joint capsule

32
Q

Function of labrum in GH joint

A

deepens socket

33
Q

Dynamic stabilizers of GH joint

A

musculature (rotator cuff, deltoid)

34
Q

Main function of rotator cuff muscles

A

pull head of humerus into glenoid fossa (centers head)

35
Q

Primary function of deltoid

A

swing humerus

36
Q

Explain force coupling in GH joint

A

Due to lever arm & muscle tone, the deltoid could pull humerus superiorly so the rotator cuff muscles have to activate before that to keep the humeral head centered in the glenoid fossa to prevent compression of structures in the subacromial space

anatomy (17 decks)

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