Anatomy & Physiology I - muscles (upper)

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Author:
jmali921
ID:
289562
Filename:
Anatomy & Physiology I - muscles (upper)
Updated:
2014-11-18 17:30:00
Tags:
muscles
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Description:
muscles of the upper limbs
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  1. Trapezius 
    O:
    occipital bone, spinous processes of C7 and thoracic vertebrae
  2. Trapezius
    I:
    clavicle, acromion and spine of the scapula
  3. Trapezius
    A:
    • superior region: elevates the clavicle and scapula
    • Middle region: adducts or retracts scapula
    • inferior region: depresses scapula and shoulder
  4. serratus anterior
    A:
    • protracts and rotates scapula upward
    • important stabilizer for actions of other muscles that abduct and raise arm as in forward punching and pushing
  5. pectoralis minor
    A:
    • moves scapula inferiorly and anteriorly as when arm is stretched forwards for an object just beyond reach
    • with scapular fixed, elevates ribs during forced inspiration
  6. levator scapulae 
    A:
    • elevates scapula and slightly rotates it downward
    • laterally flexes neck when scapula is fixed
  7. Rhomboid major
    A:
    retracts, elevates, adducts scapula and slightly rotates it downward
  8. Pectoralis Major
    I:
    I: intertubecular groove of humerus
  9. Pectoralis Major
    O:
    • medial half of clavicle
    • sternum
    • costal cartilages 1-6
  10. Pectoralis Major
    A:
    flexes, adducts and medially rotates humerus
  11. Latissimus dorsi
    A:
    extends, adducts, and medially rotates humerus, draws humerus downward as in hammering and swimming
  12. Deltoid
    O:
    acromial end of clavicle, acromion and spine of scapula
  13. Deltoid
    I:
    deltoid tuberosity of humerus
  14. Deltoid
    A:
    • abducts humerus, anterior fibbers alone flex and medially rotate humerus
    • posterior fivers alone extend and laterally rotate humerus
  15. Teres Major
    A:
    • A: extends humerus
    • assists in adduction and medial rotation of humerus
  16. Subscapularis
    A:
    • rotates humerus medially
    • helps to stabilize the shoulder joint
  17. Supraspinatus 
    A:
    • abducts humerus
    • resists downward displacement of humerus when carrying heavy objects
  18. infraspinatus
    A:
    • laterally rotates and adducts humerus
    • helps to stabilize the shoulder joint
  19. Teres minor
    A:
    • laterally rotates and adducts humerus
    • helps to stabilize the shoulder joint
  20. Triceps Brachii
    A:
    • extends forearm
    • long head assists in adduction of humerus
  21. Biceps brachii 
    A:
    • flexes forearm and supinates forearm
    • weakly flexes humerus
  22. brachioradialis 
    A:
    flexes forearm
  23. pronator teres
    A:
    pronates forearm; weakly flexes forearm
  24. flexor carpi radialis
    O:
    medial epicondyle of humerus
  25. flexor cari radialis 
    I:
    base of metacarpals II and III
  26. Flexor carpi radialis
    A:
    flexes wrist joint and abducts hand
  27. Flexor carpi ulnaris
    A:
    • flexes wrist joint
    • abducts the hand
  28. flexor digitorum superficialis 
    A:
    flexes wrist joint and middle phalanges of digits II-V
  29. Extensor carpi radialis longus 
    A:
    • extends wrist joint
    • abducts the hand
  30. Extensor Digitorum
    A:
    extends phalanges and wrist joint
  31. Extensor carpi ulnaris 
    A:
    extends wrist joint and adducts the hand
  32. Supinator
    A:
    supinates forearm

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