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24 Cards in this Set
- Front
- Back
Infraspinatus |
O: infraspinatus fossa of scapula
I: greater tubercle of humerus
A: externally rotate and adduct shoulder; stabilize head of humerus in glenoid cavity
I: suprascapular nerve C4, 5, 6
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Teres minor |
O: lateral border of scapula
I: greater tubercle of humerus
A: externally rotate and adduct shoulder; stabilize head of humerus in glenoid cavity
I: axillary nerve C5, 6
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Teres major |
O: inferior angle and lateral border of scapula
I: crest of lesser tubercle of humerus
A: extend, adduct, and internally rotate shoulder
I: lower subscapular nerve C5, 6, 7
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Supraspinatus |
O: supraspinous fossa of scapula
I: greater tubercle of scapula
A: abduct shoulder; stabilize head of humerus in glenoid cavity
I: suprascapular nerve C4, 5, 6
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Subscapularis |
O: subscapular fossa of scapula
I: lesser tubercle of humerus
A: internally rotate shoulder; stabilize head of humerus in glenoid cavity
I: upper and lower subscapular nerve C5, 6, 7
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Serratus anterior |
O: external surfaces of ribs 1-9
I: anterior surface of medial scapular border
A: -w/ ribs fixed = abduct, depress, and upwardly rotate scapula; hold medial border of scapula against rib cage -w/ scapula fixed = may elevate thorax during forced inhalation
I: long thoracic nerve C5, 6, 7, 8
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Pectoralis minor |
O: ribs 3-5
I: medial surface of coracoid process of scapula
A: depress, abduct, and downwardly rotate scapula -w/ scapula fixed = assist to elevate thorax during forced inhalation
I: medial and lateral pectoral nerves C6, 7, 8, T1
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Pectoralis major |
O: medical clavicle, sternum, and cartilage of ribs 1-6
I: crest of greater tubercle of humerus
A: -all fibers = adduct and internally rotate shoulder; assist to elevate thorax during forced inhalation -upper fibers = flex and horizontally adduct shoulder -lower fibers = extend shoulder
I: -upper fibers = lateral pectoral nerve C5, 6, 7 -lower fibers = medial and lateral pectoral nerves C6, 7, 8, T1
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Subclavius |
O: 1st rib and cartilage
I: inferior surface of clavicle
A: depress clavicle and draw it anteriorly; elevate first rib; stabilize sternoclavicular joint
I: subclavian nerve C5, 6
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Deltoid |
O: -anterior fibers = lateral clavicle -middle fibers = acromion -posterior fibers = spine of scapula
I: deltoid tuberosity of humerus
A: -all fibers = abduct shoulder -anterior fibers = flex, internally rotate, and horizontally adduct shoulder -posterior fibers = extend, externally rotate, and horizontally abduct shoulder
I: axillary nerve C5, 6
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Triceps brachii |
O: -long head = infraglenoid tubercle scapula -lateral head = posterior surface of proximal half of humerus -medial head = posterior surface of distal half of humerus
I: olecranon process of ulna
A: -all heads = extend elbow -long head = extend and adduct shoulder
I: radial nerve of C6, 7, 8, T1 |
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Biceps brachii |
O: -long head = supraglenoid tubercle of scapula -short head = coracoid process
I: radial tuberosity of radius and aponeurosis of biceps
A: flex elbow; supinate forearm; flex shoulder
I: musculocutaneous nerve C5, 6 |
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Brachialis |
O: distal half of anterior surface of humerus
I: ulnar tuberosity and coronoid process
A: flex elbow
I: musculocutaneous nerve (small branch of radial nerve) C5, 6 |
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Coracobrachialis |
O: coracoid process
I: medial surface of mid-humeral shaft
A: flex and adduct shoulder
I: musculocutaneous nerve C6, 7 |
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Anconeus |
O: lateral epicondyle of humerus
I: olecranon process of ulna
A: extend elbow
I: radial nerve C7, 8 |
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What muscles are part of the rotator cuff? |
Teres minor, infraspinatus, supraspinatus, and subscapularis |
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Which muscles contribute to shoulder flexion? |
-Upper fibers of pectoralis major -Anterior fibers of deltoid -Biceps brachii -Coracobrachialis |
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Which muscles contribute to shoulder extension? |
-Latissimus dorsi -Teres major -Lower fibers of pectoralis major -Posterior fibers of deltoid major -Long head of triceps brachii |
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Which muscles contribute to shoulder adduction? |
-Latissimus dorsi -Pectoralia major -Teres major -Teres minor -Infraspinatus -Long head of triceps brachii -Coracobrachialis |
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Which muscles contribute to shoulder abduction? |
-Deltoid -Supraspinatus |
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Which muscles contribute to shoulder internal rotation? |
-Latissimus dorsi -Teres major -Subscapularis -Pectoralis major -Anterior fibers of deltoid |
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Which muscles contribute to shoulder external rotation? |
-Teres minor -Infraspinatus -Posterior fibers of deltoid |
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Which muscles contribute to shoulder horizontal adduction? |
-Anterior fibers of deltoid -Upper fibers of pectoralis major |
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Which muscles contribute to shoulder horizontal abduction? |
-Posterior fibers of deltoid |