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MSK100 > Shoulder Joints > Flashcards

Shoulder Joints Flashcards

1
Q

Scapulothoracic Joint bones & movements?

A

scapula + thoracic cage (not a true joint)

Movements:
1. protraction/retraction
2. elevation/ depression
3. upward & downward rotation

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2
Q

Scapulothoacic joint roles (4)?

A
  1. Moveable base for humerus = Increase ROM @ shoulder joint
  2. Helps deltoid function
  3. Provides glenohumeral stability for overhead work
  4. Absorbs shock to outstretched arms
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3
Q

Sternoclavicular joint articular surfaces and joint type?

A

BONES: sternum & clavicle
AS: sternal facet (clavicle) & manubrium
TYPE: modified saddle joint

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4
Q

Sternoclavicular movement with degrees?

A
  1. Elevation = 60
  2. Depression = 5-10
  3. Protraction = 25-30
  4. Retraction = 25-30
  5. Rotation = 30
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5
Q

Ligaments at sternoclavicular joint (3)?

A
  1. Sternoclavicular ligament: reinforce joint capsule front & back
  2. Interclavicular ligament: reinforce joint superiorly
  3. Costaclavicular ligament: anchors clavicle to 1st rib
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6
Q

Acromioclavicular joint articular surfaces, joint type and movements?

A

AS: acromial facet (lateral clavicle) & acromion
TYPE: planar synovial
MOVEMENTS: slide & glide

** moves as a result of scapular movement

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7
Q

Acromioclavicular joint ligaments (3)?

A
  1. Acromioclavicular ligament: strong fibrous band, reinforces superior aspect.
  2. Trapezoid ligament: coracoid process (scapula) to trapezoid (clavicle)
  3. Conoid ligament: coracoid process (scapula) to conoid tubercle (clavicle)

> > > Conoid & trapezoid = CORACOCLAVICULAR LIGAMENT = anchor lateral end of clavicle & prevent superior dislocation

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8
Q

Glenohumeral Joint articular surfaces & Joint type?

A

AS: Glenoid fossa (scapula) & head of humerus
*AS has hyaline cartilage

TYPE: Ball & Socket (all movements)

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9
Q

What is the glenoid labrum?

A

-only 1/3 of humerus head its into glenoid fossa
-the labrum is a ring of fibrocartilage attached to the margin deepening the fossa = more congruent
-covered by synovial membrane
-biceps tendon is stuck to labrum

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10
Q

Glenohumeral joint ligaments (3)?

A
  1. Superior, middle & inferior glenohumeral ligaments: capsular ligaments. Anteriorally reinforce joint capsule.
  2. Coracohumeral ligament: Intrinsic ligament. Coracoid process to greater tubercle.
  3. Coracoacromial Arch: Extrinsic. Extend acromion to coracoid process. Prevents superior dislocation.
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11
Q

Bursae associated with the glenohumeral joint (3)?

A
  1. Subscapular bursa
  2. Subacromial bursa
  3. Subdeltoid bursa
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12
Q

Subscapular bursa?

A

-overlies anterior joint capsule beneath subscapularis muscle
-reduces friction between tendon/muscle & joint capsule

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13
Q

Subacromial bursa?

A

-between acromion & supraspinatus muscle
-Faliciates movement of tendon under coracoacromial arch, deltoid over fibrous capsule, greater tubercle
-Subject to impingement if swollen/inflammed

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14
Q

Subdeltoid bura?

A

-betwen deltoid & fibrous cartilage
- continuous with subacromial bursa.

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15
Q

Movements at shoulder joint & degrees?

A
  1. Flexion (180)
  2. Extension (45-50)
  3. Abduction (180)
  4. Adduction (30-45)
  5. Lateral Rotation (80)
  6. Medial Rotation (95)
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16
Q

Muscles that perform flexion at shoulder joint (3)?

A
  1. Deltoid
  2. Coracobrachialis
  3. Pectoralis Major
17
Q

Muscles that perform extension at shoulder joint (4)?

A
  1. Triceps (long head)
  2. Deltoid
  3. Latissimus dorsi
  4. Teres major
18
Q

Muscles that perform abduction at shoulder joint (2)?

A
  1. Deltoid
  2. Supraspinatus
19
Q

Muscles that perform adduction at shoulder joint (4)?

A
  1. Triceps (long head)
  2. Pec. Major
  3. Latissimus dorsi
  4. Teres Major
20
Q

Muscles that perform lateral rotation (3)?

A
  1. Deltoid
  2. infraspinatus
  3. Teres minor
21
Q

Muscles that perform medial rotation (5)?

A
  1. Deltoid
  2. Pec. major
  3. Subscapularis
  4. Latissimusdorsi
  5. Teres Major

MSK100 (22 decks)

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