shoulder and arms region

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Author:
Mon
ID:
74393
Filename:
shoulder and arms region
Updated:
2011-03-22 01:50:12
Tags:
joints muscles shoulder arms
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Description:
shoulder and arms region
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  1. Deltoid (anterior, middle, posterior)
    function, origin, insertion
    • Function: acting as a whole, prime mover of arm abduction; can aid in flexion, extension & rotation of humerus when specific fibers are active
    • Origin: lateral 1/3 of clavicle; acromion & spine of clavicle
    • Insertion: deltoid tuberosity of humerus
  2. Infraspinatus
    • Function: lateral rotation of humerus; helps hold head of humerus in glenoid cavity; stabilizes shoulder; abducts and laterally rotates arm
    • Origin: infraspinous fossa of scapula
    • Insertion: greater tubercle of humerus
  3. Levator Scapulae
    function, origin, insertion
    • Function: raises scapula and draws it medially; with scapula fixed, flexes neck to same side
    • Origin: cervical vertebrae (upper 3 or 4) &
    • transverse processes
    • Insertion: scapula (medial border superior part)
  4. Subscapularis
    function, origin, insertion
    • Function: internal rotation, anterior & posterior stability)
    • Origin: subscapularis fossa of scapula
    • Insertion: humerus (proximal anterior)..lesser tubercle
  5. Supraspinatus
    function, origin, insertion
    • Function: initiates abduction of humerus; stabilizes shoulder joint
    • Origin: supraspinous fossa of scapula
    • Insertion: greater tubercle of humerus
  6. Teres Major and Minor
    functions, origins, insertions
    • Teres Major (located superiorly to teres minor)
    • Function: extends, medially rotates, & adducts humerus; synergist of latissimus dorsi
    • Origin: posterior surface at inferior angle of scapula
    • Insertion: intertubercular sulcus of humerus

    • Teres Minor (located inferiorly to teres major)
    • Function: same as infraspinatus laterally rotation of humerus; helps hold head of humerus in glenoid cavity; stabilizes shoulder
    • Origin: posterior surface at inferior angle of scapula
    • Insertion: intertubercular sulcus of humerus
  7. Biceps Brachii long and short head
    function, origin, insertion
    • Biceps Brachii long and short head
    • Function: flexion (powerful) of elbow & supination of forearm
    • Origin: short head (coracoid process); tendon of long head runs in intertubercular sulcus & within capsule of shoulder joint
    • Insertion: radial tuberosity
  8. Brachialis
    function, origin, insertion
    • Function: major flexion of forearm
    • Origin: distal portion of anterior humerus
    • Insertion: coronoid process of ulna
  9. Brachioradialis
    function, origin, insertion
    • Function: synergist in forearm flexion
    • Origin: lateral ridge at distal end of humerus (lateral condyle)
    • Insertion: base of styloid process of radius
  10. Coracobrachialis
    function, origin, insertion
    • function: flexion and abduction of arm/shoulder
    • Origin:
    • Insertion:
  11. Triceps Brachii (long, medial, lateral heads)
    function, origin, insertion
    • Function: extends forearm (long head stabilizes shoulder joint)
    • Origin:
    • Insertion:
  12. Anconeus
    Function: abducts ulna during forearm pronation; extends elbow
  13. Abductor Pollicis Longus
    Function: abducts and extends thumb
  14. Extensor carpi ulnaris and radialis brevis/longus
    extends and abducts wrist
  15. Extensor digitorum
    Function: prime mover off finger extension; extends wrist; can flare (abduct) fingers)
  16. extensor pollicis brevis & longus
    Function: extend thumb
  17. flexor carpi radialis/ulnaris
    Function: powerful flexior of wrist; adducts hand
  18. flexor digitorum superficialis
    Function: flexes wrist & middle phalanges of fibers 2-5
  19. flexor digitorum profundus
    Function: pronates forearm
  20. flexor pollicis longus
    Function: flexes thumb
  21. palmaris longus
    Function: flexes wrist (weak); tenses skin & fascia of palm
  22. pronator teres
    Function: acts synergistically with pronatior quadratus to pronate forearm; weak elbow flexor
  23. pronator quadratus
    Function: pronates forearm
  24. supinator
    Function: acts with buceo brachii to supinate forarm; antagonist of pronator muscles
  25. Coracobrachialis
    function, origin, insterion
    • Function: flexion and abduction of arm/shoulder
    • Origin: attach to coracoid process of scapula
    • Insertion: middle of medial surcace and border of body of humerus (shaft of humerus)
  26. Triceps Brachii (long, medial, lateral heads)
    function, origin, insertion
    • Function: extends forearm (long head stabilizes shoulder joint)
    • Origin: scapula and humorous (posterior: superior and inferior to radial groove)
    • Insertion: ulna (proximal posterior: olecranon process)
  27. Extensor digiti minimi
    Function: extensor muscle for the pinky finger
  28. extensor indicis
    Function: extends index finger

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