Intrinisic Shoudler Muscles Flashcards Preview

ESA 2- Musculoskeletal System > Intrinisic Shoudler Muscles > Flashcards

Flashcards in Intrinisic Shoudler Muscles Deck (36):
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 innervation of the deltoid?

Axillary nerve (C5, C6)

8

What is the arterial supply of the deltoid?

Posterior circumflex humeral artery

9

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

Flexes and medially rotates arm

10

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

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

11

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

It extends and laterally rotates the arm

12

What does the teres major form?

The inferior border of the quadrangular space

13

What is the quadrangular space?

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

14

What is the innervation of the teres major?

Lower subscapular nerve (C5, C6)

15

What is the arterial supply of the teres major?

Circumflex scapular artery 
Subscapular artery

16

What is the action of the teres major?

Adducts and medially rotates the arm

17

Where do the rotator cuff muscles originate from?

The scapula

18

What do the rotator cuff muscles attach to?

The humeral head

19

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

20

What is the innervation of the supraspinatus?

Suprascapular nerve (C4, C5, C6)

21

What is the arterial supply of the supraspinatus?

Suprascapular artery

22

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

23

What is the innervation of the infraspinatus?

Suprascapular nerve (C5, C6)

24

What is the arterial supply of the infraspinatus?

Circumflex scapular artery 
Suprascapular artery

25

What is the action of the infraspinatus?

Laterally rotates the arm 
Acts with the rotator cuff muscles

26

What is the innervation of the subscapularis?

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

27

What is the arterial supply of the subscapularis?

Subscapular artery

28

What is the action of the subscapularis?

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

29

What is the innervation of the teres minor?

Axillary nerve (C5, C6)

30

What is the arterial supply of the teres minor?

Circumflex scapular artery
Posterior circumflex humeral artery

31

What is the action of the teres minor?

Laterally rotates arm 
Acts with rotator cuff muscles

32

What does rotator cuff tendonitis refer to?

Inflammation of the tendons of the rotator cuff muscles

33

What does rotator cuff tendonitis occur due to?

Secondary to repetitive use of the shoulder joint

34

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

Supraspinatus

35

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

36

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