LAB 9 Superior limb myology

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jskunz
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204419
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LAB 9 Superior limb myology
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2013-03-02 12:06:55
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superior limb myology
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superior myology
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  1. mm. of shoulder and scapula
    • 7 total
    • supraspinatus, infraspinatus, teres minor, teres major, subscapularis, deltoideus, and coracobrachialis
    • "rotator cuff" mm. involve supraspinatus, infraspinatus, teres minor, and subscapularis mm.
  2. supraspinatus m.
    • origin: supraspinous fossa of scapula
    • insertion: greater tubercle of humerus
    • action: abduct limb AT THE SHOULDER JOINT
  3. infraspinatus m.
    • origin: infraspinous fossa of scapula
    • insertion: greater tubercle of humerus
    • action: extend shoulder joint; rotate brachium laterally
  4. teres minor m.
    • origin: lateral border of scapula
    • insertion: greater tubercle of humerus
    • action: adduct limb AT SHOULDER JOINT; rotate brachium laterally
  5. teres major m.
    • origin: inferior angle of scapula
    • insertion: medial border of intertubercular groove of humerus
    • action: extend shoulder joint, adduct limb at shoulder joint, rotate brachium medially
  6. subscapularis m.
    • lies DEEP to scapula in subscapular fossa
    • origin: subscapular fossa
    • insertion: lesser tubercle of humerus
    • action: rotate brachium medially
  7. deltoideus m.
    • origin: acromial extremity of clavicle, acromion and spine of scapula
    • insertion: deltoid tuberosity of humerus
    • action: flex and extend shoulder joint, rotate brachium (both ways), abduct limb at shoulder joint
  8. coracobrachialis m.
    • origin: coracoid process of scapula
    • insertion: medial aspect of the body of the humerus
    • action: flex shoulder joint, adduct limb at shoulder joint
  9. anterior mm. of brachium
    • 3 total
    • biceps brachii m (has long and short head), brachialis m, and brachioradialis m.
  10. biceps brachii m.
    • two subdivisions - long and short heads
    • *tendon of origin of long head (which is lateral to short head) occupies the intertubercular groove of humerus
    • origin: long head - neck of scapula; short head - coracoid process of scapula
    • insertion: tuberosity of radius
    • action: flex elbow joint, flex shoulder joint, supinate antebrachium
  11. bicipital aponeurosis
    a flat tendinous sheet which diverges meddially from the main tendon and blends into the deep antebrachial fascia
  12. posterior muscles of brachium
    2: triceps brachii (has 3 heads) and anconeus m
  13. triceps brachii m.
    • has 3 heads named long, medial, and lateral heads. 
    • Long head can act on shoulder joint. Medial and lateral heads can ONLY act on cubital joint
    • origin: lh-lateral border of scapula; lath-lateral and posterior aspects of humerus; mh-medial and post. aspect of humerus
    • insertion: olecranon of ulna (all 3)
    • action: extend elbow jt, extend and adduct limb at shoulder joint (long head only)
  14. anconeus m.
    • origin: lateral epicondyle of humerus
    • insertion: olecranon (and adjacent body) of ulna
    • action: extend cubital jt.
  15. ant. mm. of antebrachium
    • 9 total, occupy anteromedial aspect of antebrachium
    • often called antebrachial flexor mm.
    • most originate on/near medial epicondyle of humerus
  16. carpal flexor retinaculum
    binds many flexor tendons to pass through carpal canal, transversely oriented
  17. flexor carpi radialis m.
    • radial flexor of wrist.
    • tight fist and flexing carpal jt. can make tendon obvious
    • origin: medial epicondyle of humerus
    • insertion: anterior aspect of bases of second and third metacarpal bones
    • action: flex carpal joint, abduct manus at carpal joint
  18. palmaris longus m.
    • origin: medial epicondyle of humerus
    • insertion: carpal flexor retinaculum, carpal ligament, and palmar aponeurosis
    • action: flex carpal jt.
  19. superficial digital flexor m.
    • origin: medial epicondyle of humerus, coronoid process of ulna, proximal aspect of radius
    • insertion: meddle phalanges of digits 2,3,4,5
    • action: flex carpal jt, metacarpophalangeal jts and proximal interphalangeal jts.
  20. deep digital flexor m.
    • origin: proximal aspect of ulna
    • insertion: base of distal phalanges digits 2,3,4,5
    • action: flex carpal jt and digital jts
    • *lies DEEP to superficial digital flexor mm. tendons pass through ('split') those of superficial dig. flex m. on anter aspect of bodies of proximal phalanges 2-5
  21. flexor pollicis longus m.
    • belly lies lateral to deep digital flexor m. on anterior antebrachium
    • origin: anterior aspect of radial body
    • insertion: distal phalanx of pollex
    • action: flex digital jts of pollex
  22. flexor carpi ulnaris m.
    • two heads (humeral head and ulnar head)
    • origin: humeral head - medial epicondyle of humerus; ulnar head - olecranon and body of ulna
    • insertion: pisiform bone, hamulus of hamate bone, base of 5th metscarpal bone
    • action: flex carpal jt, adduct manus at carpal jt.
  23. pronator teres m.
    • slants across proximal half of anterior aspect of antebrachium from medal to lateral
    • origin: medial epicondyle of humerus and medial side of coronoid process of ulna
    • insertion: lateral side of the middle aspect of body of radius
    • action: pronate the manus
  24. pronator quadratus m.
    • located near distal end of antebr. DEEP to other anterior mm.
    • origin: distal, anterior aspect of body of ulna
    • insertion: distal, anterior aspect of body of radius
    • action: pronate the manus
  25. supinator m.
    • fibers slant medially
    • origin: lateral epicondyle of humerus
    • insertion: body of radius
    • action : supinate the manus
  26. posterior mm. of antebrachium
    • 9 mm.
    • antebrachial extensor mm.
    • most originate on or near lateral epicondyle of humerus
  27. carpal extensor retinaculum
    binds extensor mm. tendons in place at doral aspect of carpus
  28. extensor carpi radialis longus m.
    • origin: lateral supracondylar crest of humerus
    • insertion: dorsal aspect of base of second metacarpal bone
    • action: extend carpal jt, abduct manus at the carpal ft.
  29. extensor carpi radialis brevis m.
    • origin: lateral epicondyle of humerus
    • insertion: dorsal aspect of base of third metacarpal bone (styloid process of Mc3)
    • action: extend carpal jt, abduct manus at the carpal jt.
  30. digital extensor m.
    • sends tendons to digits 2-5
    • origin: lateral epicondyle of humerus
    • insertion: middle and distal phalanges of digits 2-5
    • action: extend carpal jt, extend jts of digits 2-5
  31. extensor digiti minimi m.
    • extensor to 5th digit
    • origin: lateral epicondyle of humerus
    • insertion: fuses with tendon of digital extensor distributed to 5th digit
    • action: extend carpal joint, extend digital jnts of digit 5
  32. extensor carpi ulnaris m.
    • can be used as landmark dividing the extensor and flexor carpi ulnaris mm. 
    • origin: lateral epicondyle of humerus; proximal, posterior aspect of body of ulna
    • insertion: base of 5th metacarpal bone
    • action: extend carpal jt, adduct manus at carpal jt.
  33. abductor pollicis longus m.
    • forms anatomic snuffbox
    • origin: posterior aspects of radial and ulnar bodies
    • insertion: lateral side of base of first metacarpal bone
    • action: extend digital jts of thumb, abduct thumb at carpometacarpal jt.
  34. extensor pollicis brevis m.
    • short extensor m of thumb
    • origin: post. aspect of body of radius (and antebrachium interosseous membrane)
    • insertion: dorsal surface of proximal phalanx of thumb
    • action: extend metacarpophalangeal jt of thumb, abduct thum at metacarpophalangeal jt
  35. extensor pollicis longus m.
    • mm. lies DEEP to other post. anteb.mm
    • origin: posterior aspect of body of ulna (and antebrachial interosseous membrane)
    • insertion: dorsal aspect of distal phalanx of thumb
    • action: extend digital joints of thumb, abduct thumb at metacarpophalangeal jt.
  36. extensor indicis m.
    • extensor m. of index finger
    • origin: post. aspect of body of ulna
    • insertion: dorsal aspect of proximal phalanx of index finger
    • action: extend the second metacarpophalangeal jt.

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