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Shoulder region

Shoulder region. Bones Joints Muscles Vessels & Nerves. Classifications of muscles that move the shoulder. A. muscles connecting scapula to humerus B. muscles connecting trunk to scapula C. muscles connecting trunk to humerus. Biceps & Triceps tendons.

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Shoulder region

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  1. Shoulder region • Bones • Joints • Muscles • Vessels & Nerves

  2. Classifications of muscles that move the shoulder • A. muscles connecting scapula to humerus • B. muscles connecting trunk to scapula • C. muscles connecting trunk to humerus

  3. Biceps & Triceps tendons

  4. A. muscles connecting scapula to humerus • Supraspinatus • Infraspinatus • Teres minor • Subscapularis • Teres major • Coracobrachialis • Deltoid

  5. Short muscles

  6. Function:abduction

  7. Subscapularis • Function: Int. rotation

  8. Rotator Cuff

  9. Rotator cuff function: • only 25% of the humeral head is in contact with the glenoidfossa. • The rotator cuff muscles compress and depress the humeral head within the glenoidfossa.

  10. Rotator Cuff Disease photo

  11. Quiz supraspinatus infraspinatus teres minor subscapularis

  12. Teres major • Origin: • Inf angle of scapula • Insertion: • Med lip of groove • Actions: • Internal rotation and adduction of arm • Function:adduction of humerusmed rotator • Why medial?

  13. Coracobrachialis • Function:flex & adductthe shoulder joint

  14. Deltoid Origin: Clavicle, scapula Insertion: Deltoid tuberosity of humerus Actions: Abduction Anterior deltoid: internal rotation Posterior deltoid: external rotation

  15. Classifications of muscles that move the shoulder • A. muscles connecting scapula to humerus • B. muscles connecting trunk to scapula • C. muscles connecting trunk to humerus

  16. B. muscles connecting trunk to scapula • Serratus anterior • Levator scapula • Rhomboid major • Rhomboid minor • Trapezius • Pectoralis minor

  17. Serratus Anterior Origin: Ribs Insertion: Medial border of scapula Actions: Protraction and rotation of scapula

  18. Winged scapula

  19. Levator scapula Origin: Cervical vertebrae Insertion: Scapula Action: Elevation of the scapula

  20. Rhomboid major and minor Origin: Cervical and Thoracic vertebrae Insertion: Scapula Actions: Retraction Elevation

  21. Trapezius Origin: Occipital bone of skull, cervical and thoracic vertebrae Insertion: Clavicle and Scapula Actions: Elevation retraction

  22. Pectoralis Minor Origin: Ribs Insertion: Coracoid process of scapula Action: Depression of scapula

  23. Depression of scapula

  24. Classifications of muscles that move the shoulder • A. muscles connecting scapula to humerus • B. muscles connecting trunk to scapula • C. muscles connecting trunk to humerus

  25. C. muscles connecting trunk to humerus • Pectoralis major • Latissimusdorsi

  26. PectoralisMajor Origin: Clavicle, sternum, upper ribs Insertion: Crest of greater tubercle and lat lip Action: Add, med rotation

  27. LatissimusDorsi Origin: Vertebrae, sacrum, ilium Insertion: Medial lip Actions: Adduction and med rotation of humerus

  28. LatissimusDorsi if humerus is fixed

  29. Covering th front and back of the trunk. • The pectoralis major and latissimusdorsi both adduct and medially rotate the Humerus. • Lower edge of the pectoralis major muscle on rib 7 = upper edge of the latissimusdorsi on vertebra T7.

  30. Shoulder Girdle Movements

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