Muscles of shoulder and arm

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Author:
roobee
ID:
142101
Filename:
Muscles of shoulder and arm
Updated:
2012-03-17 16:27:29
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Muscles shoulder
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Muscles
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  1. Trapezius
    • Origin: posterior occipital bone; ligamentum nuchae; C7-T12
    • Insertion: clavicle, acromion process, and spine of scapula
    • Action: Extends and abducts head, rotates and adducts scapula, fixes scapula
    • Misc: if the scapula is fixed, the head moves, yet
    • the vertebral column and head are fixed, the trapezius moves the scapula
  2. Deltoid
    • Origin: Clavicle, acromion process, spine of scapula
    • Insertion: Deltoid tuberosity of the humerus
    • Action: abducts arm; flexes,extends, medially, and laterally rotates arm
    • Misc: located on top of the shoulder and is major abductor of the arm
  3. Pectoralis Major:
    • Origin: Clavicle,sternum, cartilages of ribs1-7
    • Insertion: crest of greater tubercle of humerus
    • Action: flexes, adducts, and medially rotates arm
    • Misc: has fibers that run horizontally across the chest region, and is superficial muscle of the chest
  4. Pectoralis Minor
    • Origin: ribs 3-5
    • Insertion: corocoid process of scapula
    • Action: depresses glenoid cavity, raises ribs 3-5
    • Misc: deep to pectoralis major - fibers run in more vertical direction.
  5. Latissmus Dorsi
    • Origin: T7-12, L1-5, S1-5, crest of ilium, ribs 10-12
    • Insertion: inter tubercular groove of humerus
    • Action: extends, adducts, and medially rotates arm; draws shoulder inferiorly.
    • Misc: superficial muscle of the posterior surface. Arises from vertebra by way of a broad flat lumbodorsal fascia. Butthe insertion is on the anterior aspect of the humerus. Powerful extensor of the arm and has common name of the swimmer's muscle.
  6. Superspinatus
    • Origin: supraspinous fossa
    • Insertion: greater tubercle of humerus
    • Action: abducts arm, helps stabilize shoulder joint
    • Misc: deep to the trapezius and deltoid are the muscles that originate on the scapula proper. It is a synergist to the deltoid.



    • Muscles on the dorsum of the scapula, and the Triceps brachii muscle: 3. Latissimus dorsi muscle
    • 5. Teres major muscle
    • 6. Teres minor muscle
    • 7. Supraspinatus muscle
    • 8. Infraspinatus muscle
    • 13. long head of Triceps brachii muscle

  7. Infraspinatus
    • Origin: infra spinous process
    • Insertion: greater tubercle of humerus
    • Action: laterally rotates arm, stabilizes shoulder joint


    • Muscles on the dorsum of the scapula, and the Triceps brachii muscle: 3. Latissimus dorsi muscle
    • 5. Teres major muscle
    • 6. Teres minor muscle
    • 7. Supraspinatus muscle
    • 8. Infraspinatus muscle
    • 13. long head of Triceps brachii muscle

  8. Teres Minor
    • Origin: lateral border of scapula
    • Insertion: greater tubercle of humerus.
    • Action: laterally rotates and adducts arm, stabilizes shoulder joint



    • Muscles on the dorsum of the scapula, and the Triceps brachii muscle: 3. Latissimus dorsi muscle
    • 5. Teres major muscle
    • 6. Teres minor muscle
    • 7. Supraspinatus muscle
    • 8. Infraspinatus muscle
    • 13. long head of Triceps brachii muscle

  9. Subscapularis
    • Origin: subscapular fossa
    • Insertion: lesser tubercle of humerus
    • Action: medially rotates arm, stabilizes shoulder joint
    • Misc. located on the the anterior surface of the scapula, between the scapula and the ribs. Can't be seen in the posterior view.
  10. Teres Major
    • Origin: inferior angle of scapula
    • Insertion: crest of lesser tubercle of humerus
    • Action: extends, adducts, and medially rotates arm

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