Muscles of Upper Extremities

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Muscles of Upper Extremities
2011-10-30 00:17:53

Learning Anatomy
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  1. Rhomboids
    O: Vertebrae (C7, T1-5)

    I: Vertebral (medial) border of scapula

    Action: Scapular adductions (retraction), inferior rotation, elevation
  2. Serratus Anterior
    O: Lateral anterior surface of ribs 1-9

    I: Anterior aspect of the medial border of the scapula

    Action: Scapular abduction, superior rotation
  3. Levator Scapulae
    O: Neck vertabrae (C1-4)

    I: Superior angle of scapula

    Action: Elevates the medial aspect of the scapula
  4. Pectoralis Minor
    O: Anterior surface of ribs 3-5

    I: Coracoid Process

    Actions: Scapular abduction, depression, inferior rotation
  5. Subclavius
    O: Superior aspect of rib 1

    I: Inferior groove of clavicl e

    Action: Clavice depression, stabilization of SC joint
  6. Trapezius (Part 1)
    O: Base of skull, ligamentum nuchae, spines of (C7-T12)

    I: Lateral third of clavicle, spine of scapula

    • Part 1 Action: Scapular elevation
    • (Upper Trap)
  7. Trapezius (Part 2)
    Part 2 Action: Scapular elevation, superior rotation, adduction

    (upper trap, slightly angled muscle)
  8. Trapezius (Part 3)
    Part 3 Action: Scapular adduction

    (Mid Trap, horrizotal muscle)
  9. Trapezius (Part 4)
    Part 4 Action: Adduction, superior rotation, depression

    (Lower trap, downward angle)
  10. Pectoralis Major
    O: Medial 1/2-2/3 of clavicle, sternum through aponerois of abs

    I: Crest of greater tuberosity of humerus

    • Action:
    • Clavicle division––Internal rotation, horizontal adduction, flexion, adduction and abduction of humerus
    • Sternal division–– Internal rotation, extension, and adduction
  11. Coracobrachialis
    O: Coracoid process of the scapula

    I: Middle of the medial border of the humerus opposite the deltoid tubercle

    Action: Humeral flexion, adduction, horizontal adduction
  12. Biceps Brachii
    • O: Two Heads
    • Long Head–Supraglenoid tubercle on the superior edge of the glenoid process of the scapula
    • Short Head–Coracoid process of the scapula

    I: Radial Tuberosity

    Action: Flexion, supination of forearm, and weak shoulder flexion
  13. Infraspinatus
    (Rotator Cuff Muscle)
    O: Infraspinous fossa (just belwo the spine)

    I: Posteriorly on the greater tubercle of the humerus

    Action: External rotation, horizontal abduction, extension and stabilization of the humeral head in the glenoid fossa
  14. Subscapularis
    (Rotator Cuff Muscle)
    O: Subscapular fossa on the anterior suface of the scapula

    I: Lesser tubercle of the humerus

    Action: Humeral adduction, extension, internal rotation, stabilization of the head of the humerus in the glenoid fossa
  15. Deltoid
    • O: Anterior–Lateral portion of the anterior aspect of clavicle
    • Middle–Lateral edge of the acromion process of scapula
    • Posterior–Inferior edge of the spine of the scapula

    I: Deltoid tuberosity (on the humerus)

    Actions: abduction, flexion, medial rotation, lateral rotation
  16. Supraspinatus
    (Rotator Cuff Muscle)
    O: Supraspinous fossa of scapula

    I: Superiorly on greater tubercle of humerus

    Actions: Weak abduction, stabilization of the humeral head in the glenoid fossa
  17. Latissimus Dorsi
    O: Illum, Sacrum. T6-T12, lower 3 ribs

    I: Medial lip of the intertubercule groove of the humerus

    Action: Horizontal abduction, extends, and adduction
  18. Teres Major
    O: Lateral border of scapula

    I: Medial lip of the intertubercular groove of the humerus

    Action: Adduction, extention, medial rotation
  19. Triceps Brachii
    • O:
    • Long Head–Infraglenoid tubercle below inferior lip of glenoid fossa
    • Lateral head– Posterior upper 1/3 of humerus
    • Medial head– Posterior lower 2/3 of humerus

    I: Olecranon process of ulna

    Actions: Extension of elbow, extention and adduction of shoulder
  20. Teres Minor
    (Rotator Cuff Muscle)
    O: Posteriorly on the upper and middle portions of the lateral boder of the scapula

    I: Posteriorly on the greater tubercle of the humerus

    Actions: External rotation, horizontal abduction, and stabilization of the humeral head in the glenoid fossa
  21. Brachialis
    O: Anterior lower half of the humerus

    I: Anterior coronoid process of ulna

    Action: Flexion
  22. Brachioradialis
    O: Lateral supracondylar ridge of humerus

    I: Lateral styloid process of radius

    Action: Elbow flexion
  23. Pronator Teres
    O: Medial epicondyle of humerus

    I: Lateral radius, near middle

    Action: Pronation, slight flexion
  24. Pronator Quadratus
    O: Anterior lower 1/4 of ulna

    I: Anterior lower 1/4 of raduis

    Action: Pronation
  25. Anconeus
    O: Lateral epicondyle of humerus

    I: Lateral olecranon process and posteriro ulna

    Action: Extension
  26. Supinator
    O: Lateral epicondyle of humerus

    I: Anterior/ Lateral upper third of radius

    Action: Supination
  27. Flexor Carpi Radialis Muscle
    O: Medial epicondyle of the humerus

    I: Bone of second and third metacarpal, anterior

    Action: Wrist flexion, radial deviation, weak elbow flexion
  28. Flexor Carpi Ulnaris
    O: Medial epicondyle of humerus, posterior aspect of proximal ulna

    I: Pisiform, hamate, and base of fith metacarpal

    Actions: Wrist flexion, ulnar deviaton, weak elbow flexion
  29. Palmaris Longus
    O: Medial epicondyle of humerus

    I: Palmaris aponeurosis of second, thrid, fourth, and fifth metacarpals

    Action: Wrist flexion, weak elbow flexion
  30. Extensor Carpi Radialis Longus
    O: Lower 1/3 of the lateral supracondyler ridge of humerus and lateral epicondyle of the humerus

    I: Base of second metacarpal

    Action: Wrist extension radial deviation, and weak elbow flexion
  31. Extensor Carpi Radialis Brevis
    O: Lateral epicondyle of humerus

    I: Base of third metacarpal

    Action: Wrist extension, radial deviation, weak elbow extension
  32. Extensor Carpi Ulnaris
    O: Lateral epicondyle of humerus, middle 2/4 of the posterior border of the ulna

    I: Base of fifth metacarpal

    Actions: Wrist extension, ulnar deviation, and weak elbow extension