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A Review of the Shoulder Muscles and Their Actions

A Review of the Shoulder Muscles and Their Actions

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A Review of the Shoulder Muscles and Their Actions

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  1. A Review of the Shoulder Muscles and Their Actions

  2. What muscle works closely with the anterior deltoid? Pectoralis major What muscle is involved in any lifting movements? Deltoid What is the major (strongest) extensor muscle? Latissimus Dorsi Name the four rotator cuff muscles. Subscapularis, Supraspinatus, Infraspinatus, and Teres minor. What muscle works closely with the infraspinatus? Teres minor Questions

  3. Name the muscles for Horizontal Adduction Pect Major (both) Corachobrachialis Deltoid (anterior) Name the muscles for Horizontal Abduction Deltoid (post) Infraspinatus Teres minor Lats Practice

  4. List the muscles that do flexion of the shoulder Coracobrachialis Pectoralis major (upper to 60°) Anterior Deltoid Practice • List the muscles that do extension of the shoulder • Latissimus dorsi • Teres major • Posterior deltoid • Pectoralis major (lower fibers to neutral)

  5. List the muscles that do adduction of the shoulder Pectoralis major (lower and upper below 90°) Coracobrachialis Latissimus dorsi Teres major Practice List the muscles that do abduction of the shoulder • Deltoid (all sections) • Supraspinatus • Pectoralis major (upper past 90°)

  6. List the muscles that do internal rotation of the shoulder Subscapularis Latissimus dorsi Teres major Anterior deltoid Pect. major Practice • List the muscles that do external rotation of the shoulder • Infraspinatus • Teres minor • Posterior deltoid

  7. Name the muscle. Coracobrachialis Name the action Adduction of the shoulder Also, flexion and hor. add.

  8. Name the muscle. Pectoralis Major

  9. Name the muscle. Subscapularis Name the action Internal rotation of the shoulder

  10. Name the muscle. Deltoid Name the action Abduction of shoulder

  11. Name the muscle. Infraspinatus Name the action External rotation

  12. Name the action Name the muscle. Adduction of scapula Teres Major

  13. Name the muscle. Teres Minor Name the action if the humerus move directly to the posterior Extension of the shoulder

  14. Name the muscle. Supraspinatus Name the action Abduction of the shoulder

  15. Coracobrachialis Pect. Major Subscapularis Deltoid

  16. Supraspinatus Teres Major Infraspinatus Teres Minor

  17. What position are her shoulders in? Flexion

  18. What position is his right shoulder in? Horizontal Abduction and External Rotation

  19. What rotation action is his shoulder performing as he continues to through the ball? Internal Rotation

  20. What position are her shoulders in? Flexion

  21. What position are his shoulders in? Horizontal abduction or Extension

  22. Position of their shoulders? 2. 1. Extension Flexion

  23. What is the position of shoulders? Extension

  24. Shoulder Muscle Exercises

  25. Pectoralis major Push-ups Pull-ups Bench press Throwing Tennis serve Latissimus dorsi Chinning Robe climb Dips on parallel bars Pullover exercises Pulldown exercises Rowing Major Muscles of the Shoulder

  26. Shoulder action = ? Shoulder muscle(s) = ? Deltoid Supraspinatus Abduction

  27. Shoulder action = ? Shoulder muscle(s) = ? Flexion Ant Deltoid Upper Pect Major Coracobrach.

  28. Shoulder action = ? Shoulder muscle(s) = ? Ant. Deltoid Pect. Major (both) Coracobrachialis Horizontal Add.

  29. Shoulder action = ? Shoulder muscle(s) = ? Horizontal Abduction Latissimus Dorsi Post. Deltoid Teres Minor Infraspinatus

  30. Shoulder action = ? Shoulder muscle(s) = ? Adduction Pect. Major (both) Coracobrachialis Latissimus Dorsi Teres Major

  31. Shoulder action = ? Shoulder muscle(s) = ? Horizontal Add Ant. Deltoid Pect. Major (both) Coracobrachialis

  32. Shoulder action = ? Shoulder muscle(s) = ? Extension Lats Teres Major Post. Deltoid Pectoralis Major (lower) Infraspinatus Teres minor

  33. Shoulder action = ? Shoulder muscle(s) = ? External Rotation Infrspinatus Teres Minor Post. Deltoid

  34. Name a shoulder muscle isolated with the following exercises. • Side arm dumbbell raises • Deltoid • Push-ups • Pectoralis major • Rowing and pull-overs • Latissimus dorsi

  35. What is the action to the left? What muscles perform that action? External Rotation Internal Rotation Internal Rotation Subscapularis, Ant. Deltoid, Pect, Major, Lats. And Teres Major

  36. Rotator Cuff Exercises External Rotation Internal Rotation External Rotation Abduction (to work the supraspinatus)

  37. Shoulder Related Injuries • The shoulder is built for motion, not stability • Injury rate depends on… • Shallowness of glenoid fossa • Laxity of ligaments • Strength of muscles

  38. Shoulder subluxation • Incomplete or partial dislocation • Shoulder dislocation • Complete dislocation of the GH joint • Most common anteriorly and inferiorly • Shoulder separation • Complete dislocation of the AC joint

  39. Shoulder Dislocation

  40. Impingement Syndrome

  41. Impingement Syndrome • A condition that decreases the subacromial space • Acromion process • Coracoacromial ligament • Causes • Swelling • Bone spurs • Anatomical structure 

  42. Impingement Syndrome

  43. Rotator Cuff Tears

  44. Rotator cuff • Subscapularis • Supraspinatus • Infraspinatus • Teres minor

  45. Movement of RC Muscles • Subscapularis is an internal rotator of the arm. • Supraspinatus assists the deltoid in abducting the arm, with its greatest contribution being the initiation of abduction. • Infraspinatus and teres minor muscles both externally rotate the arm.

  46. Rotator Cuff Injury • The throwing motion has been divided into five phases: wind-up, cocking, acceleration, and follow-through. • Cocking phase • Subscapularis fires in late cocking phase to decelerate the shoulder's external rotation. Also, it is stretched during the cocking phase.

  47. Rotator Cuff Injury • Follow-through (muscles fire most intensely) • Subscapularis internally rotates the shoulder, • The infraspinatus and teres minor contract eccentrically to decelerate the arm and are stretched. • During this repetitive eccentric loading, the rotator cuff is prone to overload, fatigue, tendinitis, and even a partial undersurface tear.

  48. Note: Surgery needs to be performed within 3 months or the supraspinatus muscle will atrophy and be too short to reattach

  49. Glenoid Labrum