Intrinisic Shoudler Muscles Flashcards Preview

► Med Misc 25 > Intrinisic Shoudler Muscles > Flashcards

Flashcards in Intrinisic Shoudler Muscles Deck (48):
1

Where do the intrinsic muscles of the shoulder originate from?

The scapula and/or clavicle

2

Where do the intrinsic muscles of the shoulder attach to?

The humerus

3

What are the intrinsic muscles of the shoulder?

Deltoid 
Teres major 
Supraspinatus 
Infraspinatus 
Subscapularis 
Teres minor

4

What muscles are considered to be part of the rotator cuff group?

Supraspinatus 
Infraspinatus 
Subscapularis 
Teres minor

5

What shape is the deltoid muscle?

Triangle

6

What can the deltoid muscle be divided into?

Anterior (clavicular), middle (acromial) and posterior (spinal) parts

7

What is the proximal attachment of the deltoid?

Lateral third of the clavicle

8

What is the proximal attachment of the deltoid?

Deltoid tuberosity of humerus

9

What is the innervation of the deltoid?

Axillary nerve (C5, C6)

10

What is the arterial supply of the deltoid?

Posterior circumflex humeral artery

11

What is the action of the clavicular part of the deltoid?

Flexes and medially rotates arm

12

What is the action of the acromial part of the deltoid?

Abducts arm- takes over from supraspinatus, which abducts the first 15º

13

What is the action of the spinal part of the deltoid?

It extends and laterally rotates the arm

14

What does the teres major form?

The inferior border of the quadrangular space

15

What is the quadrangular space?

The ‘gap’ that the axillary nerve and posterior circumflex humeral artery pass through to reach the posterior scapula region

16

What is the proximal attachment of the teres major?

Posterior surface of the inferior angle of the scapula

17

What is the distal attachment of the teres major?

Medial lip of intertubercular sulcus of humerus

18

What is the innervation of the teres major?

Lower subscapular nerve (C5, C6)

19

What is the arterial supply of the teres major?

Circumflex scapular artery 
Subscapular artery

20

What is the action of the teres major?

Adducts and medially rotates the arm

21

Where do the rotator cuff muscles originate from?

The scapula

22

What do the rotator cuff muscles attach to?

The humeral head

23

What do the rotator cuff muscles collectively do?

The resting tone of these muscles acts to ‘pull’ the humeral head into the glenoid fossa, giving the glenohumeral joint a lot of additional stability

24

What is the proximal attachment of the supraspinatus?

Supraspinous fossa of the scapula

25

What is the distal attachment of the supraspinatus?

Superior facet of the greater tubercle of the humerus

26

What is the innervation of the supraspinatus?

Suprascapular nerve (C4, C5, C6)

27

What is the arterial supply of the supraspinatus?

Suprascapular artery

28

What is the muscle action of the supraspinatous?

Initiates (0-15º) and assists the deltoid (15-90º) in abduction of the arm
Acts with rotator cuff muscles

29

What is the proximal attachment of the infraspinatus?

Infraspinous fossa of scapula

30

What is the distal attachment of the infraspinatus?

Middle facet of the greater tubercle of humerus

31

What is the innervation of the infraspinatus?

Suprascapular nerve (C5, C6)

32

What is the arterial supply of the infraspinatus?

Circumflex scapular artery 
Suprascapular artery

33

What is the action of the infraspinatus?

Laterally rotates the arm 
Acts with the rotator cuff muscles

34

What is the proximal attachment of the subscapularis?

Subscapular fossa (most of anterior surface of scapula)

35

What is the distal attachment of the subscapularis?

Lesser tubercle of humerus

36

What is the innervation of the subscapularis?

Upper and lower subscapular nerves (C5, C6, C7)

37

What is the arterial supply of the subscapularis?

Subscapular artery

38

What is the action of the subscapularis?

Medially rotates arm
As part of rotator cuff, helps hold head of humerus in glenoid cavity

39

What is the proximal attachment of the teres minor?

Middle part of lateral border of scapula

40

What is the distal attachment of the teres minor?

Inferior facet of greater tubercle of humerus

41

What is the innervation of the teres minor?

Axillary nerve (C5, C6)

42

What is the arterial supply of the teres minor?

Circumflex scapular artery
Posterior circumflex humeral artery

43

What is the action of the teres minor?

Laterally rotates arm 
Acts with rotator cuff muscles

44

What does rotator cuff tendonitis refer to?

Inflammation of the tendons of the rotator cuff muscles

45

What does rotator cuff tendonitis occur due to?

Secondary to repetitive use of the shoulder joint

46

What is the muscle most commonly affected in rotator cuff tendonitis?

Supraspinatus

47

Why is the supraspinatus the muscle most commonly affected in rotator cuff tendonitis?

During abduction, it ‘rubs’ against the coraco-acromial arch, which over time causes inflammation and degenerative changes in the tendon itself

48

What does treatment of rotator cuff tendonitis involve?

Conservative treatment includes rest, analgesia and physiotherapy
In more servere cases, steroid injections and surgery can be considered