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The Shoulder

The Shoulder. Label the Shoulder. The shoulder is made up of three bones. Humerus – upper arm bone. Clavicle. Scapula – shoulder blade. Scapula. Clavicle – collar bone. Humerus. Anatomy of the Shoulder. The head of the humerus fits into a rounded socket in the scapula.

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The Shoulder

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  1. The Shoulder

  2. Label the Shoulder • The shoulder is made up of three bones • Humerus – upper arm bone Clavicle • Scapula – shoulder blade Scapula • Clavicle – collar bone Humerus

  3. Anatomy of the Shoulder • The head of the humerusfits into a rounded socket in the scapula • A combination of muscles and tendons keeps the humerus centered in the socket

  4. The Shoulder Girdle • The muscles of the shoulder girdle act on the scapula, primarily to stabilize it. • There are six major muscles that anchor the scapula. • Four posterior muscles (Trapezius, Rhomboid Major, Rhomboid Minor, Levator Scapulae) • Two anterior muscles (Pectoralis Minor, Serratus Anterior)

  5. The Shoulder Girdle Since the scapula has no bony articulations with the rib cage it essentially floats The main function of the shoulder girdle muscles is to fixate the scapula When the scapula is immobilized it serves as a point of origin for the muscles of the humerus (upper arm bone)

  6. Posterior Muscles of the Shoulder Girdle

  7. Anterior Muscles of the Shoulder Girdle

  8. Major Muscles That Act at the Shoulder Girdle

  9. The Shoulder • The shoulder joint is the most mobile joint in the body. • There are a total of nine muscles that cross the shoulder joint (inserting on the humerus). • Seven muscles originate from each scapula. • Supraspinatus, infraspinatus, subscapularis, teres minor, deltoid, teres major, and coracobrachialis) • Two muscles originate from the axial skeleton (no attachment on the scapula). • Pectoralis major, latissiumusdorsi

  10. The Shoulder Anterior Deltoid and Pectoralis Major

  11. The Shoulder- LatissiumusDorsi, Pectoralis Major and Deltoid, Lateral View

  12. The Shoulder – Posterior Muscle of the Shoulder Joint

  13. The Rotator Cuff • Four of the muscles that act at the shoulder are commonly called the rotator cuff. • The rotator cuff’s primary stabilizing function is to hold the humeral head in the glenoidfossa to prevent subluxation (dislocation). • The muscles of the rotator cuff can be remembered using the acronym SITS: • Supraspinatus • Infraspinatus • Teres minor • Subscapularis

  14. The Rotator Cuff – Anterior View

  15. The Rotator Cuff – Posterior View

  16. Coracobrachialis Coracobrachialis

  17. Major Muscles That Act at the Shoulder

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