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anatomy: first med > Shoulder joint > Flashcards

Shoulder joint Flashcards

1
Q

six scapulohumeral muscles

A
  • subscapularis
  • supraspinatus
  • infraspinatus
  • teres major
  • teres minor
  • deltoid
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2
Q

rotator cuff SITS muscles

A
  • supraspinatus
  • infraspinatus
  • teres minor
  • subscapularis
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3
Q

function of SITS muscles

A

to hold the humeral head in the glenoid cavity of the scapula

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4
Q

supraspinatus origin

A

supraspinous fossa of scapula

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5
Q

supraspinatus insertion

A

superior facet of greater tubercle of humerus
goes through capsule of shoulder joint

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6
Q

supraspinatus innervation

A

suprascapular nerve

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7
Q

supraspinatus action

A
  • aids deltoid in abduction of arm
  • stabilises shoulder joint
  • acts with rotator cuff muscles
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8
Q

infraspinatus origin

A

infraspinous fossa of scapula

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9
Q

infraspinatus insertion

A
  • middle facet of greater tubercle of humerus
  • through capsule of shoulder joint
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10
Q

infraspinatus innervation

A

suprascapular nerve

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11
Q

infraspinatus action

A
  • lateral rotation of humerus
  • stabilises shoulder joint
  • acts with rotator cuff muscles
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12
Q

teres minor origin

A

middle part of lateral border of scapula

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13
Q

teres minor insertion

A
  • inferior facet of greater tubercle of humerus
  • through capsule of shoulder joint
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14
Q

teres minor innervation

A

axillary nerve

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15
Q

teres minor action

A
  • lateral rotation of humerus
  • stabilises shoulder joint
  • acts with rotator cuff muscle
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16
Q

subscapularis origin

A

subscapular fossa

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17
Q

subscapularis insertion

A
  • lesser tubercle of humerus
  • fuses with capsule of shoulder joint
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18
Q

subscapularis innervation

A

subscapular nerve

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19
Q

subscapularis action

A
  • medial rotation of humerus
  • acts with rotator cuff muscles
  • helps hold head of humerus in glenoid cavity
20
Q

SITS movement

A
  • all except supraspinatus are rotators of humerus
  • supraspinatus initiates and assists deltoid in arm abduction
21
Q

teres major origin

A
  • posterior surface of inferior angle of scapula
  • inferior 1/3 of lateral border of scapula
22
Q

teres major insertion

A

medial lip of bicipital groove of humerus

23
Q

teres major innervation

A

lower subscapular nerve

24
Q

teres major action

A
  • medial rotation of arm
  • adduction of arm
25
Q

deltoid

A

divided into 3 parts
- anterior (clavicular)
- posterior (spinal)
- middle (acromial part)
forms rounded contour of shoulder

26
Q

deltoid origin

A
  • lateral 1/3 of clavicle
  • acromion
  • spine of scapula
27
Q

deltoid insertion

A

deltoid tuberosity of humerus

28
Q

deltoid innervation

A

axillary nerve

29
Q

deltoid action

A
  • clavicular/anterior: flexion, medial rotation
  • acromial/middle: abduction
  • spinal/posterior: extension and lateral rotation of arm
30
Q

articulations of the glenohumeral joint

A

head of humerus with glenoid cavity of scapula

31
Q

what type of joint is the glenohumeral joint?

A

Synovial, ball-and-socket

32
Q

what is the glenoid labrum

A

fibrocartilaginous tissue within the glenoid cavity of shoulder joint
attaches to edges of glenoid cavity

33
Q

function of glenoid labrum

A
  • deepen glenoid cavity
  • provide stability and shock absorption to shoulder
  • protects shoulder against dislocation
34
Q

anterior support tendon of GH joint

A

subscapularis tendons

35
Q

posterior support tendon of GH joint

A

teres minor and infraspinatus tendons

36
Q

superior support tendon of GH joint

A

supraspinatus tendon

37
Q

ligaments of GH joint

A
  • coracohumeral ligament
  • transverse humeral ligament
  • superior glenohumeral ligament
  • middle glenohumeral ligament
  • inferior glenohumeral ligament
38
Q

coracohumeral ligament

A
  • Coracoid process to greater tubercle
  • Stabilises joint superiorly
39
Q

Transverse humeral ligament

A
  • Bridges the intertubercular groove
  • Holds tension of long head of biceps brachii in bicipital groove
40
Q

glenohumeral ligament

A
  • 3 ligaments representing thickenings of the anterior portion of the articular capsule
  • Stabilise joint anteriorly
  • Superior, middle, inferior
  • Pass from superomedial margin of glenoid cavity to the lesser tubercle and anatomical neck of humerus
41
Q

coracoacromial arch

A
  • acromion
  • coracoid process
  • coracoacromial ligament
42
Q

Tendon that restricts upper movement of the humeral head on glenoid cavity

A

Tendon of the long head of biceps brachii

43
Q

Subacromial/subdeltoid bursa

A
  • Between acromion or deltoid and supraspinatus tendon
  • Inflammation of this bursa can cause sever shoulder problems
44
Q

Blood supply to GH joint

A
  • Circumflex humeral arteries
  • Branches of axillary and suprascapular arteries
45
Q

Innervation of GH joint

A

Small branches of:
- axillary nerves
- Subscapular nerves
- Musculocutaneous nerves
- Pectoral nerves
- Suprascapular nerves

46
Q

Shoulder dislocation

A
  • displacement of humeral head from glenoid cavity
  • rotator cuff stabilises shoulder joint
  • weakest inferiorly and anteriorly
  • humeral head break through joint capsule below glenoid cavity

anatomy: first med (17 decks)

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