shoulder/elbow

Card Set Information

Author:
jtsterner
ID:
3174
Filename:
shoulder/elbow
Updated:
2009-12-15 17:57:39
Tags:
shoulder/elbow muscles
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Description:
Origin, Insertion, Innervation & Function
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  1. Deltoid
    O -Inferior angle of the crest of the spine of the scapula, lateral margin of acromion, anterior border of lateral one-third of clavicle

    I -Deltoid tuberosity of humerus

    In -Axillary nerve [C5,C6]

    F -Major abductor of arm (abducts arm beyond initial 15* done by supraspinatus); clavicular fibers assist in flexing the arm; posterior fibers assist in extending the arm
  2. Teres Major
    O -Elongate oval area on the posterior surface of the inferior angle of the scapula

    I -Medial lip of the intertubercular sulcus on the anterior surface of the humerus

    In -Lower (inferior) subscapular nerve [C5,C6.C7]

    F -Medial rotation, adduction, and extension of the arm at the glenohumeral joint
  3. Supraspinatus
    O -Supraspinatus Fossa

    I -Most superior facet on the greater tubercle of the humerus

    In -Suprascapular nerve [C5,C6]

    F -Rotator cuff muscle; initiation of abduction of arm to 15* at glenohumeral joint
  4. Infraspinatus
    O -Infraspinatus Fossa

    I -Middle facet on posterior surface of the greater tubercle of the humerus

    In -Suprascapular nerve [C5,C6]

    F -Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint
  5. Teres Minor
    O -Middle part of lateral border of scapula

    I -Inferior facet on the posterior surface of the greater tubercle of the humerus

    In -Axillary nerve [C5,C6]

    F -Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint
  6. Subscapularis
    O -Subscapular fossa

    I -Lesser tubercle of humerus

    In -Upper & lower subscapular nerves [C5,C6,C7]

    F -Rotator cuff muscle; medial rotation of the arm at glenohumeral joint
  7. Biceps brachii
    O -Long head-supraglenoid tubercle of scapula; short head-apex of coracoid process

    I -Radial tuberosity

    In -Musculocutaneous nerve [C5,C6]

    F -Powerful flexor of the forearm at the elbow joint and supinator of the forearm; accessory flexor of the arm at glenohumeral joint
  8. Triceps brachii
    O -Long head-infraglenoid tubercle of scapula; medial & lateral heads-posterior surface of humerus

    I -Olecranon

    In -Radial nerve [C6,C7,C8]

    F -Extension of the forearm at elbow joint. Long head can also extend & adduct the arm at glenohumeral joint
  9. Coracobrachialis
    O -Apex of coracoid process

    I -Linear roughening on midshaft of humerus on medial side

    In - Musculocutaneous nerve [C5,C6,C7]

    F -Flexor of the arm at glenohumeral joint
  10. Brachialis
    O -Anterior aspect of humerus (medial & lateral surfaces) & adjacent intermuscular septae

    I -Tuberosity of ulna

    In - Musculocutaneous nerve [C5,C6]; (small contribution by radial nerve [C7] to lateral part of muscle)

    F -Powerful flexor of the forearm at elbow joint
  11. Brachioradialis
    O -Proximal part of lateral supraepicondylar ridge of humerus & adjacent intermuscular septum

    I -Lateral surface of distal end of radius

    In -Radial nerve [C5,C6] before division into superficial & deep branches

    F -Accessory flexor of elbow joint when forearm is midpronated

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