Muscles that Cross the Shoulder Joint

Muscles that Cross the Shoulder Joint - Muscles that Cross...

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Muscles that Cross the Shoulder Joint
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These muscles act on the humerus 9 muscles o 3 prime movers o 6 other muscles are synergistic (help move the humerus) and act as stabilizers (4 rotator cuff muscles)
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Prime Movers of the Shoulder
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Latissimus dorsi Pectoralis major Deltoid
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Scapular Muscles
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Anterior – o Coracobrahialis o Biceps brachii o Deltoid Posterior – o Teres major
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Axial Muscles
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Anterior – o Pectoralis major Posterior o Latissimus dorsi
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Coracobrachialis
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Anterior scapular muscle Origin - scapula Inserts - humerus Action – stabilizes shoulder joint; assists in flexion and adduction (FA - Fran Adds)
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Biceps brachii
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2 heads Anterior scapular muscle Origin - scapula Inserts - Action – weakly flexes shoulder o Main action is to move the forearm (next section)
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Deltoid
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Anterior, middle, and posterior fibers; Anterior scapular muscle Origin - scapula Inserts - humerus Action - o Anterior fibers – medial rotation; flexion (MF Meri Frowns) o Middle fibers – abducts
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o Posterior fibers – lateral rotation; extension; (LE – Lisa Eats)
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Muscles that Cross the Shoulder Joint - Muscles that Cross...

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