322_Shoulder_joint

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Author:
itzlinds
ID:
253317
Filename:
322_Shoulder_joint
Updated:
2013-12-16 22:19:09
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shoulder joint
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shoulder joint
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  1. list the 3 bones of the shoulder joint
    • scapula
    • clavicle
    • humerus
  2. describe 2 characteristics of the gelnohumeral (GH) Joint:
    • spherical head of the humerus: convex
    • small, shallow glenoid fossa of scapula: concave allows for more mobility
  3. list the following characteristics of the glenohumeral joint:

    joint type:
    degrees of freedom:
    • joint type: ball and socket
    • degrees of freedom: 3
  4. describe the motions that occur at the glenohumeral joint:

    what planes of motion do each occur in:
    • ABD/ADD
    • 120 degrees of ABD
    • 0 degrees of ADD, blocked by torso
    • occurs in frontal plane

    • internal/external roation
    • internal: 70-90 degrees
    • external: 70-90 degrees
    • occurs in transverse plane

    • horizontal ABD/ADD
    • Horiz ABD: 45 degrees
    • Horiz ADD: 135 degrees

    • Flexion/Extension
    • Flexion: 120 degrees
    • Extension: 50 degrees

    scaption
  5. describe the general characteristics of GH joint stability:
    • the GH joint is better designed for mobility
    • frequently injured due to anatomical design
    • glenoid fossa is shallow and small
    • labrum deepens fossa
    • ligaments are lax: accommodate wide ROM
    • joint capsule is loose
    • lack of strength & endurance in muscles
    • rotator cuff muscles: not rotation, fxn stablize humeral head in the glenoid fossa
  6. describe the characeteristics of the glenoid labrum:
    • deepens the fossa
    • provides cushioning: impact forces
    • prevents excessive translation of the humeral head :linear motion
  7. list the 4 ligamentous reinforcements of the GH joint:
    • coracohumeral
    • superior glenohumeral
    • middle glenohumeral
    • inferior glenohumeral

    • anterior is more ligaments
    • posterior is more muscle
  8. describe the characteristics of the GH joint capsule:
    • large and loose: larger than the humeral head
    • allows 1-2 inches of distraction
    • redundant fold (axillary pouch): allows for ABD
  9. describe the fxn and the 2 roles off the rotator cuff muscles at the GH joint:
    • primary fxn:  stablize humeral head in glenoid fossa
    • compression of GH joint: joint compression resists translation forces (lindar); centers humeral head
    • dynamic ligament tension: muscles fuse to ligaments, so when muscles contract, force is transmitted to the ligaments
  10. list the msucular reinforcements of the GH joint in the following locations..

    superior:
    inferior:
    anterior:
    posterior:
    • superior
    • supraspinatus
    • long head of the biceps (does not cause flexion of the GH joint)

    • inferior
    • long head of the triceps

    • anterior
    • subscapularis
    • pectoralis major
    • teres major

    • posterior
    • infraspinatus
    • teres minor

    these muscles are primary for stability at the GH joint.
  11. what is the definition of a force couple:
    2 or more forces that attaches on a segment (opposite sides of an axis) and pull in opposite directions, with the end result is rotation
  12. list 3 pairs of GH joint force couple pairs:
    • deltoid/ Infraspinatus, Teres minor, Subscapularis (ITS) - prevents anterior translation
    • lower serratus anterior/ lower trapezius (combination of the 2 pulls causes protraction)
    • levator scapulae/ weight of the arm
  13. why do force couples give stablity at the GH joint?
    elimination of linear motion
  14. list the joint actions that occur at the GH joint:
    • flexion/extension
    • abduction/adduction
    • external/internal rotation
    • horziontal ABD/ADD
    • diagnoal ABD/ADD
    • circumduction
  15. list the following shoulder girdle motion that pairs with the accompanying shoulder joint motion:

    ABD:
    ADD:
    • ABD: upward rotation
    • ADD downward rotation
  16. list the following shoulder girdle motion that pairs with the accompanying shoulder joint motion:

    Flexion:
    Extension:
    • flexion: Elevation/upward rotation
    • extension: depression/downward rotation
  17. list the following shoulder girdle motion that pairs with the accompanying shoulder joint motion:

    internal rotation:
    external rotation:
    • internal rotation: protraction (abduction)
    • external rotation: retraction (adduction)
  18. list the superior muscles of the shoulder joint:
    • deltoid
    • supraspinatus
  19. list the posterior muscles of the shoulder joint:
    • infraspinatus
    • teres minor
  20. list the anterior muscles of the shouler joint:
    • subscapularis
    • pectoralis major
    • coracobrachialis
    • biceps brachii (stability)
  21. list the inferior muscles of the shoulder joint:
    • latissimus dorsi
    • teres major
    • long head of the triceps brachii (stability)
  22. list the fxn of the deltoid group:

    list the fxn of the anterior deltoid:

    list the fxn of the middle deltoid:
    deltoid group: powerful abductor

    • anterior deltoid
    • ABD
    • flexion
    • horziontal ADD
    • internal rotation

    middle: ABD
  23. what are the 3 fxn of the supraspinatus:
    • weak ABD; works with deltoid
    • weak flexion
    • stabilizes GH joint

    • important dynamic stabilizer in thrower
    • most often injured of rotator cuff muscles
  24. what are the 3 fxns of the infraspinatus:
    • external rotation: most powerful
    • horizontal ABD
    • extension

    • maintains posterior stablity of humeral head in fossa
    • effective when rhomboids stabilize scapula
    • 2nd most injured rotator cuff muscle
  25. what are the 3 fxns of the teres minor:
    • external rotation
    • horizontal ABD
    • extension

    • stabilizes humeral head in glenoid fossa
    • fxns similarly to infraspinatus; same actions
  26. what are the 3 fxns of the subscapularis:
    • internal rotation
    • adduction
    • extension

    • stabilization of GH joint
    • provides anterior and inferior stability
  27. what are the 4 fxns of the clavicular portion of the pectoralis major:
    • flexion
    • horizontal ADD
    • internal rotation
    • ABD/ADD
  28. what are the 4 fxns in sternocostal portion of the pectoralis major:
    • internal rotation
    • horizontal ADD
    • extension
    • ADD
  29. list the 3 fxns of the coracobrachialis:
    • horizontal ADD
    • assists in flexion
    • assists in add
    •  
    • most fxnal in horizontal add
    • stabilizes shoulder joint
  30. list the 4 fxns of the latissimus dorsi:
    • ADD: strong action
    • extension
    • internal rotation
    • horizontal abduction

    one of the most important extensors; powerful in chinning
  31. what are the 3 fxns of the teres major:
    • extension (from flexed)
    • internal rotation
    • ADD (from abducted)

    • effective only when rhomboids stabilize scapula
    • works effective with lats
  32. list the 3 flexors of the GH joint:
    • anterior deltoid
    • coracobrachilais
    • pectoralis major- clavicular
  33. list the 5 extensors of the GH joint:
    • latissimus dorsi
    • posterior deltoid
    • teres major
    • pectoralis major-sternal
    • SITS
  34. list the 5 abductors of the GH joint:
    • anterior deltoid
    • middle deltoid
    • posterior deltoid
    • pectoalis major - clavicular
    • supraspinatus
  35. list the 6 adductors of the Gh joint:
    • latissimus dorsi
    • coracobrachialis
    • teres major
    • pectoralis major - sternal
    • pectoralis major - clavicular
    • subscapularis
  36. list the 5 internal rotators of the GH joint:
    • anterior deltoid
    • teres major
    • latissimus dorsi
    • pectoralist major - both
    • subscapularis
  37. list the 3 external rotators of the GH joint:
    • posterior deltoid
    • infraspinatus
    • teres minor
  38. list the 4 horizontal ABD of the GH joint:
    • posterior deltoids
    • latissimus dorsi
    • infraspinatus
    • teres minor
  39. list the 3 horizontal ADD of the Gh joint:
    • anterior deltoids
    • coracobrachialis
    • pectoralis major - both

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