Pectoral Region and Shoulder Flashcards Preview

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Flashcards in Pectoral Region and Shoulder Deck (64):
1

Name the four bones involved in shoulder/pectoral region?

Sternum, Clavicle, Scapula and Humerus

2

Name the four joints of the shoulder complex?

Sternoclavicular (SC); Acromioclavicular (AC); Glenohumeral and Scapulothoracic*

3

What are the articular components of the SC joint?

Sternal end of the clavicle and the manubrium of the sternum

4

What joint type is the SC joint? Movements possible?

Synovial joint - saddle joint; Elevation/Depression plus Protraction/Retraction

5

How many ligaments associated with SC joint? Names?

3 ligaments;
Between the two bones of interest = sternoclavicular lig
Between the two clavicles = interclavicular lig
Between the clavicle and 1st rib = costoclavicular lig

6

Articular components of the AC joint?

Acromion process of scapula and acromial end of clavicle

7

What joint type is the AC joint?

Plane - synovial joint

8

How many ligaments associated with the AC joint? Names?

Only 2? Acromioclavicular ligament and coracoclavicular ligament

9

Articular components of the glenohumeral joint?

Glenoid fossa of scapula and humeral head

10

What type of joint is the glenohumeral joint? Actions?

Triaxial - ball and socket synovial joint
ABduction/Adduction; Flexion/Extension; Internal/External rotation

11

Function of the glenoid labrum?

To deepen the glenoid cavity and make a better articulation between humeral head and glenoid fossa

12

Glenohumeral ligaments is a regional thickening of what structure?

The synovial joint capsule!! NB: There is a superior, middle and inferior glenohumeral ligament

13

Name the ligaments involved in the glenohumeral joint?

Glenohumeral joints - sup./middle/inf.
Coracohumeral - btwn coracoid process and humerus
Coracoacromial - btwn coracoid process and acromion process of scapula
Transverse humeral - btwn greater and lesser tubercle covering the intertubercular groove

14

What 3 structures contribute to the coracoacromial arch?

The coracoid process, the acromion process and the coracoacromial ligament!

15

What's the main function of the coracoacromial arch? What tendon passes beneath it?

Prevents the superior displacement of the humeral head; tendon of supraspinatus muscle passes beneath arch to insert on superior facet of greater tubercle

16

Describe scapulohumeral rhythm.

The fact that full range of motion of the humerus is not due solely to motion at glenohumeral joint... remainder of motion contributed by scapulothoracic joint

17

What is the movement ratio between the glenohumeral and scapulothoracic joints?

2:1 so for example in a 180 degree motion 120 degrees of motion was accomplished by GH while 60 was accomplished by ST joints
NB: 0-30 degrees GH joint only
30-180 degrees 2:1 GH and ST joints

18

Extrinsic muscles of the shoulder include (5)?

Trapezius, Latissimus Dorsi and then Rhomboid Minor and Major plus Levator Scapulae

19

Trapezius attachments

O: External occipital protuberance, spinous processes of C7-T12

I: Lateral third of clavicle, spine of scapula and acromion process

20

Trapezius Action

Upper: Elevate scapula, upward rotation
Middle: Retraction of scapula
Lower: Depression of scapula, upward rotation

21

Trapezius innervation

Accessory nerve (CNXI)

22

Latissimus Dorsi attachements

O: Thoracolumbar fascia and spinous process of T6-T12 and iliac crest
I: Floor of intertubercular groove of humerus

23

Latissimus Dorsi Actions

Extension, adduction and medial rotation of humerus

24

Latissimus Dorsi Innervation

Thoracodorsal nerve

25

Rhomboid Minor Attachments

Spinous processes of C7-T1
Medial border of scapula

26

Rhomboid Minor actions

Retraction and downward rotation of scapula

27

Rhomboid minor innervation

Dorsal scapular nerve (C5) - supraclavicular branch

28

Rhomboid major attachment

Spinous process of T2-T5
Medial border of scapula

29

Rhomboid major action

Retraction and downward rotation of scapula

30

Rhomboid major innervation

Dorsal scapular nerve (C5)

31

Levator scapulae attachments

transverse process of C1-C4
Superior medial border of scapula

32

Levator scapulae actions

Elevation and downward rotation of scapula

33

Levator scapulae innervation

Dorsal scapular nerve

34

Pectoralis major attachments

Sternocostal head: sternum and costal cartilages
Clavicular head: Medial half of clavicle
Intertubercular groove of humerus (lateral lip)

35

Pectoralis major action

Adduction and Internal rotation of humerus

36

Pectoralis major innervation

Medial and lateral pectoral nerve

37

Pectoralis minor attachment

Coracoid process
Ribs 3-5

38

Pectoralis minor action

Protracts and depresses scapula

39

Pectoralis minor innervation

Medial pectoral nerve

40

Serratus Anterior attachments

Lateral surface of ribs 1-8
Medial border of scapula

41

Serratus Anterior actions

Protraction, upward rotation and holds scapula against thoracic wall

42

Serratus Anterior innervation

Long thoracic nerve (C5-C7)

43

Coracobrachialis attachments

Coracoid process of scapula
Medial midshaft of humerus

44

Coracobrachialis Actions

Adduction/Flexion of shoulder

45

Coracobrachialis Innervation

Musculocutaneous (C5-C7)

46

Deltoid attachments

Lateral 1/3 of clavicle, acromion, spine of scapula
Deltoid tuberosity of humerus

47

Deltoid Actions

Anterior: shoulder flexion
Middle: shoulder ABduction
Posterior: shoulder extension

48

Deltoid innervation

Axillary (C5-C6)

49

Teres Major attachments

Inferior angle of scapula
Intertubercular groove of humerus

50

Teres Major actions

Internal rotation of shoulder/ADduction of shoulder

51

Teres Major innervation

Lower subscapular nerve (Medial Cord)

52

Name the 4 rotator cuff muscles

Supraspinatus
Infraspinatus
Teres Minor
Subscapularis

53

Supraspinatus Attachments

Supraspinous fossa
Greater tubercle of humerus

54

Infraspinatus Attachments

Infraspinous Fossa
Greater tubercle of humerus

55

Teres Minor Attachments

Lateral border of scapula
Greater tubercle of humerus

56

Subscapularis Attachments

Subscapular fossa
Lesser tubercle of humerus

57

Supraspinatus Action

Shoulder ABduction

58

Infraspinatus Action

External/Lateral rotation of shoulder

59

Teres Minor Action

External/Lateral rotation of shoulder

60

Supraspinatus Innervation

Suprascapular nerve (C5-C6)

61

Infraspinatus Innervation

Suprascapular nerve (C5-C6)

62

Teres Minor Innervation

Axillary N. like the Deltoid

63

Subscapularis Innervation

Upper and lower subscapular nerve

64

Subscapularis Action

Medial/Internal rotation of shoulder