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functional anatomy > GH Joint > Flashcards

GH Joint Flashcards

(48 cards)

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1
Q

Resting position of GH joint

A

55 ABD
30 Horiz ADD
Slight ER

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2
Q

CPP of GH jt

A

Max ABD and ER

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3
Q

Capsular pattern of GH jt

A

ER>ABD>IR

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4
Q

During Flexion the GH joint works for how many degrees?

A

120 degrees of movement

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5
Q

Prime Flexion movers

A

Ant delt
Pec major (clavicular head)
Coracobrachialis
Biceps brachii

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6
Q

Extension of GH degrees

A

65 degrees

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7
Q

Prime extension movers of GH

A

Post delt
Teres major
Lat Dorsi
Long head of triceps
Pec major (sternocostal part)

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8
Q

Abduction GH joint

A

(When in ER) 120 degrees

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9
Q

Abduction prime movers

A

Supraspinatus
lat delt

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10
Q

Adduction GH joint

A

0 pure adduction at side
50-75 degrees in front of body

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11
Q

Adduction prime movers

A

Post delt
Ant delt
Pec major
Long head of triceps
Coracobrachialis
Teres major
Lat dorsi

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12
Q

Extemal rotation In GH joint

A

60-70° of pure ER
ER increases to 90 when shoulder is ABD

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13
Q

External rotation prime movers

A

Post delt
Teres minor
Infraspinatus
Supraspinatus (between neutral and full ER)

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14
Q

Internal rotation of GH

A

75° - 85° of pure IR

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15
Q

Internal rotation prime movers

A

Anterior deltoid
Pectoral major
Teres major
lat dorsi
Subscapularis

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16
Q

Variables that determine the pattern of movements within the fossa

A

Articular geometry
Capsuloligamentous influences
Positional influences
Muscle dynamics

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17
Q

Stabilizing structures of the GH

A

Rotator cuff muscle
Capsule
GH ligaments
Coracohumeral ligament
Coracoacromial arch
Long head of biceps
Glenoid labrum
Negative intra-articular pressure
Compressive forces

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18
Q

Rotator cuff muscles

A

Provide static stability through reinforcement of the capsule
Provide most of the dynamic GH stability

Supra
Infra
Teres minor
Subscap

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19
Q

Capsule

A

It’s loose and expandable
The space was in the capsule. It can be twice the size of the humeral head.
It is lined with synovium

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20
Q

Superior GH ligament

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A

Becomes taut when the arm is at the side or with inferior and posterior translation of the humerus

21
Q

Middle GH ligament

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A

Restricts an interior translation of the GH and resists ER
Most effective at 45 to 60° of abduction

22
Q

Inferior GH ligament

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A

Anterior band: prevent interior translation of the GH with the arm abducted to 90° or greater.
-Strongest and thickest part of the entire capsule

Posterior band: prevent posterior translation of the GH with the arm abducted to 90° or greater

Auxiliary pouch: TAUT in abduction more than 90 degrees

23
Q

Coracohumeral ligament

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A

Limits inferior displacement of the GH with arm at the side
Extremes of external rotation, when shoulder is in Adduction

24
Q

Coracoacromial Arch

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A

Consist of the coracoid the acromion and the coracoacromial ligament
Prevent the humerus from dislocating superiorly

25
Structures under the coracoacromial arch
Rotator cuff tendons Long head of biceps Subacromial bursa Sub deltoid bursa
26
Long head of the biceps
An important attachment to the labrum Role in humeral head, depression Limiting excessive anterior translation
27
Glenoid labrum
Deepens the Glenoid fossa providing increased stability
28
Negative intra-articular pressure
Can be lost if the capsule is punctured
29
Compressive forces
These forces hold the humeral head in the glenoid fossa Due to the upward orientation of the scapula, the force of vectors of gravity and the superior GH restraints.
30
Scapular plane
The scapula is not fully in the frontal plane. It is 30 to 45° toward the sagittal plane.
31
Scapulohumeral rhythm
Rhythm between the GH abduction and scapulothoracic upward is relatively constant and has a ratio of 2 to 1 For every 3° of shoulder abduction 2° occur at the GH while one degree occurs at the ST joint
32
Role of scapular movement
Maintains glenoid fossa in optimal position Allows muscles to maintain good length – tension relationship Allows for increased ROM
33
SC and AC involvement
In the early phase of shoulder abduction, less than 90 degrees, 60% of abduction at the Gleno humeral joint and 30° of scapular rotation. Of the 30° of scapular rotation: 20 to 25° of clavicular elevation at the SC joint and 5 to 10° of upward rotation of the acromion at the AC joint.
34
SC and AC Involvment in the late phase shoulder ABD more than 90 degrees
Of 30 degrees of scap rotation and 60 degrees of ABD at GH 5 degrees clavicular elevation at the SC 20-25 upward rotation at the acromion at the AC joint 40 degrees posterior rotation of clavicle
35
Deltoid anterior
Origin: outer 1/3 of the clavicle Insertion: deltoid tuberosity Innervation: axillary nerve Action: ABD, FLEX, MEDROT,HORIZ ABD
36
Lateral deltoid
Origin: lateral acromion Insertion: deltoid tuberosity Innervation: axillary nerve Action: ABD
37
Posterior deltoid
Origin: spine of scap Insertion: deltoid tuberosity Innervation: axillary nerve Action: ABD, EXT,HORIZ ABD, EXT ROT
38
Pec major clavicular portion
Origin: medial 1/3 clavicle Insertion: lat lip of bicipital groove of humerus Innervation: lateral and medial pec nerve C5-T1 Action: Flex to 60 deg
39
Pec major sternocostal part
Origin: sternum, coral cartilage 1-6 Insertion: lateral lip of bicipital groove of humerus Innervation: medial and lateral pectoral nerve C5-T1 Action: Ext 180-120 putting arm down from full extension
40
Lat dorsi
Origin: T7-L5 spinous processes by dorsilumbar fascia, posterior sacrum, iliac crest and last 3 ribs Insertion: medial floor of bicipital groove Innervation: thoracodorsal nerve C6-C8 Action: ADD, MED ROT, EXT
41
Teres major
Origin: axillary border, inferior angle of scap, dorsal surface Insertion: crest lesser tubercle Innervation: lower subscapular nerve C5-C7 Action: ADD,MED ROT, EXT
42
Supraspinatus
Origin: Supraspinous fossa Insertion: greater tubercle Innervation: suprascspular nerve C5-C6 Action: ABD, ER
43
Infraspinatus
Origin: Infraspinous fossa Insertion:greater tubercle Innervation: suprascapular nerve C5-C6 Action : LAT ROT, HORIS ABD
44
Teres minor
Origin: axillary border of scap or lateral margin of infraspinous fossa Insertion: greater tubercle Innervation axillary nerve Action: LAT ROT, HORIZ ABD
45
Subscapularis
Origin: subscapular fossa Insertion: lesser tubercle Innervation: upper and lower subscapular nerve Action: MED ROT, ADD
46
Coracobrachialis
Origin: coracoid process of the scap Insert: medial surface of humerus Innervation: musculocutaneous nerve C6-C7 Action: FLEX, ADD
47
Biceps brachii
Origin: Long head- supraglenoid tubercle. Short head- coracoid process Insertion: radial tuberosity Innervation: musculocutaneous nerve C5-C6 Action: FLEX
48
Triceps brachii
Origin: long head- infraglenoid tubercle Insertion: olecranon process of the ulna Innervation: radial nerve Action: EXT

functional anatomy (3 decks)

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