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Muscles of the Human Body!
Muscles That Move Scapula and Arm
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Pectoralis MinorDraws scapula forward and down
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Serratus Anterior• Moves scapula upwards, out (abduction) and
forward.• “boxers muscle”
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TrapeziusStabilizes, raises (shrug shoulder), retracts
(adduct), rotates scapula. Also extend head and neck
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Levator Scapulae
Elevates/adducts the scapula
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Rhomboids (Major & Minor)• Retracts/Adducts (moves together) and
depressesscapula; • “squaring shoulders” (like downward motion
of paddling a canoe)
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Pectoralis Major• Prime mover of arm flexion and adduction;
rotates arm medially; • Can help in climbing, throwing, and pushing
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Latissimus Dorsi• Prime mover of arm extension and adductor; • medially rotates arm at shoulder.• Bringing the arm down in a power stroke
(striking a blow, hammering, swimming, and rowing)
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Deltoid• Prime mover of arm abduction when all
fibers active• Front fibers: arm flexion. Back fibers: arm
extension. (arms during walking)
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Rotator Cuff Muscles
Main function is to Reinforce the capsule of the shoulder joint to prevent dislocation of the humerus.
Supraspinitus
Infraspinitus
Teres Minor
Subscapularis
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Teres MajorExtends, medially rotates, and adducts
humerus; synergist of latissimus dorsi