Origin, incestion and actions of the muscles of the shoulder girdle and shoulder
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| Upper Trapezius Origin | Occipital Bone
Ligamentum nuchae
Spinous processes of C7 -T4
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| Upper Trapezius Insertion | Lateral Clavicle
Acromion
Superior border of spine of scapula.
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| Upper Trapezius Action | Elevation of scapula
Retraction of the scapula
Upward rotation of scapula.
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| Lower Trapezius Origin | SP of T4-T12
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| Lower Trapezius Insertion | Inferior, medial half of spine of scapula.
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| Lower Trapezius Actions | Depression of scapula
Retraction of Scapula
Downward Rotation of scapula
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| Levator Scapula Origin | Transverse Processes of C1-C4
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| Levator Scapula Insertion | Superior Angle of scapula
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| Levator Scapula Action | Elevates the scapula
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| Rhomboid Major Origin | SP of T1-15
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| Rhomboid Major Insertion | Medial border of scapula above and including inferior angle.
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| Rhomboid Major Action | Retraction of scapula
Elevation of scapula
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| Rhomboid Minor Origin | SP of C6-T1
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| Rhomboid Minor Insertion | Medial border of scapula above and including root of spine
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| Rhomboid Minor Action | Retraction of scapula
Elevation of scapula
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| Serratus Anterior Origin | Anterolateral surface of upper 9 ribs
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| Serratus Anterior Insertion | Costal Surface of medial border of scapula.
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| Serratus Anterior Action | Protracts the scapula
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| Pectoralis Minor Origin | Anterior surfaces of 3rd, 4th, and 5th ribs.
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| Pectoralis Minor Insertion | Coracoid process of the scapula
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| Pectoralis Minor Action | Depression of scapula
Elevates the ribs
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| Pectoralis Major Origin | Medial half of the clavicle
Sternum
Abdominal aponeurosis
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| Pectoralis Major Insertion | Bicipital groove of the humerus.
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| Pectoralis Major Action | Adduction of humerus at the shoulder
Flexion of the humerus
Medial rotation of the humerus
Horizontal adduction of the humerus
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| Coracobrachialis Origin | Caracoid process of the scapula
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| Coracobrachialis Insertion | Middle 1/3 medial surface of the humerus.
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| Coracobrachialis Action | Flexion of the humerus at the shoulder
Adduction of the humerus at the shoulder
Horizontal adduction of the humerus at the shoulder
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| Teres Major Origin | Dorsal surface of lower axillary border of scapula
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| Teres Major Insertion | Bicipital groove of the humerus
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| Teres Major Action | Adduction of the humerus at the shoulder.
Medial rotation of the humerus at the shoulder.
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| Deltoid (anterior) Origin | Lateral half of the clavicle
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| Deltoid (anterior) Insertion | Deltoid tuberosity of the humerus
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| Deltoid (anterior) Action | Abduction of the humerus
Horizontal adduction of the humerus
Medial rotation of the humerus
Flexion of the humerus
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| Deltoid (middle) Origin | Acromion process of the scapula
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| Deltoid (middle) Insertion | Deltoid tuberosity of the humerus
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| Deltoid (middle)Action | Abduction of the humerus at the shoulder
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| Deltoid (posterior) Origin | Spine of scapula
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| Deltoid (posterior) Insertion | Deltoid tuberosity of the humerus
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| Deltoid (posterior) Action | Abduction of the humerus
Horizontal abduction of the humerus
Extension of the humerus
Lateral rotation of the humerus
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| Latissimus Dorsi Origin | Thoraculmbar aponeurosis from T7 to the iliac crest
Lateral surfaces of the lower 4 ribs
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| Latissimus Dorsi Insertion | Bicipital groove of the humerus
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| Latissimus Dorsi Action | Extension of the humerus
Medial rotation of the humerus
Adduction of the humerus.
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| Supraspinatus Origin | Supraspinous fossa of the scapula
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| Supraspinatus Insertion | Greater tubercle of the humerus
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| Supraspinatus Action | Abduction of the humerus at the shoulder.
Stabilizes the shoulder joint.
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| Teres Minor Origin | Dorsal surface of axillary border of the scapula
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| Teres Minor Insertion | Greater tubercle of the humerus
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| Teres Minor Action | Lateral rotation of the humerus
Stabilizes the shoulder joint
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| Infraspinatous Origin | Infraspinatous Fossa of the scapula
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| Infraspinatous Insertion | Greater tubercle of the humerus
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| Infraspinatous Action | Lateral rotation of the humerus
Stabilizes the shoulder joint
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| Subscapularis Origin | Subscapular fossa
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| Subscapularis Insertion | Lesser tubercle of the humerus
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| Subscapularis Action | Medial rotation of the humerus
Stabilizes the shoulder joint
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