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15 Cards in this Set
- Front
- Back
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shoulder joint
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ball and socket
loosely fitted 3 major GH ligaments to protect and stabilize plus others in area muscles also protect and stabilize rotator cuff- small muscles stabilize and assist mov't |
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rotator cuff
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supraspinatus
infraspinatus teres minor subscapularis |
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movements of shoulder joint
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flexion (and hyper)
extension (and hyper) abduction adduction external rotation internal rotation horizontal adduction/abd circumduction |
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muscles of the shoulder joint
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superior: Deltoid and supraspinatus
anterior: pectoralis major, coracobrachialis, subscapularis, biceps brachii posterior: latissimus dorsi, teres major, infraspinatus, teres minor, triceps brachii |
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deltoid muscle
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anterior fibers: abduct, flexion, horizontal adduction and internal rotation
posterior fibers: abduct, extension, horizontal abduction and external rotation. middle fibers: abduct |
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superior supraspinatus
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weak abduction (action), stabilization of humeral head of glenoid fossa
origin: supraspinous fossa of scapula insertion: superiorly on greater tubercle of humerus |
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pectoralis major muscle
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upper fibers (clavicular head): internal rotation, horizontal adduction, flexion and adduction (w/ are below 90 degrees, upper fibers assist in further adduction)
lower fibers (sternal head): internal rotation horizontal adduction, extension, adduction |
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ANTERIOR coracobrachialis
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flexion (sagital), adduction (frontal), no rotation (horizontal adduction)
origin: coracoid process of the scapula insertion: middle of the medial border of the humerus opposite the deltoid tubercle |
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ANTERIOR subscapularis
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internal rotation, adduction (frontal), sagital (extension), stabilization of the humeral head in glenoid fossa
origin: subscapular fossa on the anterior surface of the scapula insertion: lesser tubercle of the humerus |
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ANTERIOR biceps brachii
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main action at elbow
origin: long head: superglenoid tubercle on the superior edge of the glenoid process of the scapula. short head: coracoid process of the scapula insertion: radial tuberosity flexion of shoulder, flexion of elbow, supination of forearm |
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latissumus dorsi
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adduction (frontal), extension (sagital), internal rotation (transverse), horizontal abduction
origin: posterior crest of the ilium, back of the sacrum and spinous processes of the lumbar and lower 6 thoracic vertabrae slips from the lower 3 ribs insertion: medial lip of the inertubercular groove of the humerus |
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POSTERIOR teres major muscle
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extension: particularly fro mthe flexed position of the posteriorly extended position
internal rotation adduction: particularly from the abducted position down to the side and toward midline of body origin: posteriorly on the inferior third of the lateral border of the scapula and just superior of the inferior angle insertion: medial lip of the intertubercular groove of the humerus MINOR: external rotation, extension, hor abd |
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POSTERIOR infraspinatus
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external rotation, horizontal abduction, extension, stabilization of humeral head in the glenoid fossa
origin: infraspinous fossa insertion: posteriorly on the greater tubercle of the humerous |
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POSTERIOR triceps brachii
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3 heads
origin: long head: infraglenoid tubercle below inferior lip of glenoid fossa insertion: olecranon process of ulna ~all heads extension of elbow long head: extension, adduction of shoulder joint |
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rotator cuff muscles (SITS)
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Supraspinatus: attach to greater tubercle from above (abduct)
Infraspinatus: attach to greater tubercle posteriorly Teres Minor: attach to greater tubercle posteriorly Subscapularis: attach to lesser tubercle anterior |
