Muscles of the Shoulder and Upper Arm
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Transcript of Muscles of the Shoulder and Upper Arm
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Muscles of the
Shoulder/Upper Arm
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Movements of the Humerus
(upper arm at the shoulder) Movements of the humerus:
Flexion and Extension
Abduction and Adduction
External and Internal Rotation
Horizontal flexion or Horizontal adduction
Horizontal extension or Horizontal abduction
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Flexion and Extension
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Abduction and Adduction
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External and Internal Rotation
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Horizonal flexion or adduction
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Horizontal extension or
abduction
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Muscles of the Shoulder/Upper Arm
Anterior:
Pectoralis major, Coracobrachialis,
Subscapularis
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Pectoralis major
Origin:
Clavicle, sternum, and costal
cartilage of ribs
Insertion: Near the intertubercular
groove of the humerus
Actions:
Flexion, horizontal flexion,
internal rotation, adduction
Used in bench press, push-
up, pull-ups, throwing, tennis
serves
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Pectoralis Major
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Coracobrachialis
Origin:
Coracoid process ofscapula
Insertion:
Humerus (medial)
Actions:
Flexion, adduction,horizontal flexion
Primarily an assistingmuscle
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Coracobrachialis
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Subscapularis
Origin:
Subscapular fossa ofscapula
Insertion:
Lesser tubercle ofhumerus
Actions:
Internal rotation,extension andadduction
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Subscapularis
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Deltoid
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Muscles of the Shoulder/Upper
Arm Posterior:
Latissimus dorsi, Teres major and minor,
Infraspinatus
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Latissimus Dorsi
Origin:
Vertebrae, sacrum,ilium
Insertion:
Near theintertubercular grooveof humerus
Actions:
Extension (primemover), adduction,internal rotation,horizontal extension
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Latissimus Dorsi
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Teres Major
Origin:
Lateral border of thescapula
Insertion:
Humerus (anterior)
Actions:
Extension, internalrotation, and adduction
*synergist withLatissimus dorsi
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Teres Major
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Teres Minor
Origin:
Lateral border ofscapula
Insertion:
Greater tubercle ofhumerus
Actions:
External rotation,extension, horizontalextension
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Teres Minor
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Subscapularis
Origin:
Subscapular fossa ofscapula
Insertion:
Lesser tubercle ofhumerus
Actions:
Internal rotation,extension andadduction
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Subscapularis
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Supraspinatus
Origin:
Supraspinous fossa of
the scapula
Insertion:
Greater tubercle of the
humerus
Action: Abduction (synergist
with deltoid)
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Supraspinatus
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Infraspinatus
Origin:
Infraspinous fossa ofscapula
Insertion:
Greater tubercle ofhumerus
Action:
External rotation,extension, horizontalextension
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Infraspinatus