Shoulder joint Flashcards
(46 cards)
1
Q
six scapulohumeral muscles
A
- subscapularis
- supraspinatus
- infraspinatus
- teres major
- teres minor
- deltoid
2
Q
rotator cuff SITS muscles
A
- supraspinatus
- infraspinatus
- teres minor
- subscapularis
3
Q
function of SITS muscles
A
to hold the humeral head in the glenoid cavity of the scapula
4
Q
supraspinatus origin
A
supraspinous fossa of scapula
5
Q
supraspinatus insertion
A
superior facet of greater tubercle of humerus
goes through capsule of shoulder joint
6
Q
supraspinatus innervation
A
suprascapular nerve
7
Q
supraspinatus action
A
- aids deltoid in abduction of arm
- stabilises shoulder joint
- acts with rotator cuff muscles
8
Q
infraspinatus origin
A
infraspinous fossa of scapula
9
Q
infraspinatus insertion
A
- middle facet of greater tubercle of humerus
- through capsule of shoulder joint
10
Q
infraspinatus innervation
A
suprascapular nerve
11
Q
infraspinatus action
A
- lateral rotation of humerus
- stabilises shoulder joint
- acts with rotator cuff muscles
12
Q
teres minor origin
A
middle part of lateral border of scapula
13
Q
teres minor insertion
A
- inferior facet of greater tubercle of humerus
- through capsule of shoulder joint
14
Q
teres minor innervation
A
axillary nerve
15
Q
teres minor action
A
- lateral rotation of humerus
- stabilises shoulder joint
- acts with rotator cuff muscle
16
Q
subscapularis origin
A
subscapular fossa
17
Q
subscapularis insertion
A
- lesser tubercle of humerus
- fuses with capsule of shoulder joint
18
Q
subscapularis innervation
A
subscapular nerve
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
deltoid
divided into 3 parts
- anterior (clavicular)
- posterior (spinal)
- middle (acromial part)
forms rounded contour of shoulder
26
deltoid origin
- lateral 1/3 of clavicle
- acromion
- spine of scapula
27
deltoid insertion
deltoid tuberosity of humerus
28
deltoid innervation
axillary nerve
29
deltoid action
- clavicular/anterior: flexion, medial rotation
- acromial/middle: abduction
- spinal/posterior: extension and lateral rotation of arm
30
articulations of the glenohumeral joint
head of humerus with glenoid cavity of scapula
31
what type of joint is the glenohumeral joint?
Synovial, ball-and-socket
32
what is the glenoid labrum
fibrocartilaginous tissue within the glenoid cavity of shoulder joint
attaches to edges of glenoid cavity
33
function of glenoid labrum
- deepen glenoid cavity
- provide stability and shock absorption to shoulder
- protects shoulder against dislocation
34
anterior support tendon of GH joint
subscapularis tendons
35
posterior support tendon of GH joint
teres minor and infraspinatus tendons
36
superior support tendon of GH joint
supraspinatus tendon
37
ligaments of GH joint
- coracohumeral ligament
- transverse humeral ligament
- superior glenohumeral ligament
- middle glenohumeral ligament
- inferior glenohumeral ligament
38
coracohumeral ligament
- Coracoid process to greater tubercle
- Stabilises joint superiorly
39
Transverse humeral ligament
- Bridges the intertubercular groove
- Holds tension of long head of biceps brachii in bicipital groove
40
glenohumeral ligament
- 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
coracoacromial arch
- acromion
- coracoid process
- coracoacromial ligament
42
Tendon that restricts upper movement of the humeral head on glenoid cavity
Tendon of the long head of biceps brachii
43
Subacromial/subdeltoid bursa
- Between acromion or deltoid and supraspinatus tendon
- Inflammation of this bursa can cause sever shoulder problems
44
Blood supply to GH joint
- Circumflex humeral arteries
- Branches of axillary and suprascapular arteries
45
Innervation of GH joint
Small branches of:
- axillary nerves
- Subscapular nerves
- Musculocutaneous nerves
- Pectoral nerves
- Suprascapular nerves
46
Shoulder dislocation
- 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
