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Trapezius
Trapezius
- Origin: External occipital bone protuberance,medial portion of superior nuchal line of the occiput, ligamentum nuchae and the spinous process of C-7 through T-12
- Insertion: Lateral 1/3 of the clavical,acrimonium, and spine of the scapula.
- Action: laterally flex, rotate, elevate, retract, depress, or rotate scapula upward and/or elevate clavicle; extend neck
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Rhomboideus Minor
Rhomboideus Minor
- Origin: spinous process of vertebrae C7-T1
- Insertion: vertebral border of scapula
- Action: adducts & performs downward rotation of scapula
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Rhomboideus Major
Rhomboideus Major
- Origin: spinous process of superior thoracic vertebrae
- Insertion: vertebral border of scapula from spine to inferior angle
- Action: adducts and downward rotation of scapula
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Supraspinatus
Supraspinatus
- Origin: supraspinous fossa of scapula
- Insertion: greater tuberacle of humerus
- Action: abduction at the shoulder
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Infraspinatus
Infraspinatus
- Origin: infraspinous fossa of scapula
- Insertion: greater tubercle of humerus
- Action: lateral rotation at shoulder
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Deltoid
- Origin: Lateral one-third of the clavicle,acrimonium,and spine of thescapula
- Insertion: deltoid tuberosity of humerus
- Action: abducts shoulder, flexion and extension, medial and lateral rotation of humerus
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Teres Minor
Teres Minor
- Origin: upper 2/3rd of the lateral border of scapula
- Insertion: greater tubercle of humerus
- Action: lateral rotation at shoulder
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Teres Major
Teres Major
- Origin: inferior angle and 1/3rd lateral border of the scapula
- Insertion: crest of the lesser tuberacle of the humerus
- Action: extension of the shoulder, adduction & medial rotation at shoulder
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Subscapularis
Subscapularis
- Origin: subscapular fossa of scapula
- Insertion: lesser tubercle of humerus
- Action: medial rotation at shoulder
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Latissimus Dorsi
- Origin: Inferior angle of the scapula, spinious process of the last six throacic vertebrae, last three of 4 ribs, thorcolumbar aproneurosis and posterior illiac crest
- Insertion: intertubercular groove of the humerus
- Action: extension, adduction, and medial rotation at shoulder
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