MSK Session 3- Back And Shoulder Muscles, And The Shoulder Joint Flashcards Preview

SOPHIE'S ESA 2 > MSK Session 3- Back And Shoulder Muscles, And The Shoulder Joint > Flashcards

Flashcards in MSK Session 3- Back And Shoulder Muscles, And The Shoulder Joint Deck (36)
0

What are intrinsic back muscles responsible for?

Posture

1

What are the three groups of extrinsic back muscles?

-superficial
-deep
-scapulo-humeral

2

What are the two superficial back muscles?

Trapezius
Latissimus dorsi

3

What are the 2 deep back muscles?

Levator scapulae
Rhomboids

4

What are the 2 scapulo-humeral muscles?

Teres major
Deltoid

5

What is the action of each of the parts of the trapezius?

-descending/superior fibres- elevate and rotate the scapula
-middle fibres- retract the scapula
-ascending/inferior fibres- depress the scapula
-abduction past 90 degrees

6

What is the innervation of the trapezius muscle?

Spinal accessory nerve

7

What is the action of the latissimus dorsi?

Extension, adduction and medial rotation of the upper limb.

8

What is the innervation of the latissimus dorsi?

Thoracodosral nerve

9

What is the action of the Levator scapulae muscle?

Elevates the scapula

10

What is the innervation to the Levator scapulae?

Dorsal scapula nerve

11

What is the action of the rhomboids?

Retraction and rotation of the scapula.

12

What is the innervation to the rhomboids?

Dorsal scapula nerve

13

Which rhomboid is most superior?

Minor

14

What is the action of the the three deltoid segments?

-anterior/clavicular fibres- flexion of the arm
-middle/acromial fibres - abduction of the arm between 15 and 90 degrees.
-posterior/spinal fibres - extension of the arm

15

What is the innervation to the deltoid muscle?

Axillary nerve

16

What is the action of teres major?

Adduction and medial rotation of the arm.

17

What is the innervation to teres major?

Lower subscapular nerve

18

What are the four rotator cuff muscles?

Supraspinatus
Infraspinatus
Teres minor
Subscapularis

19

What is the general function of the rotator cuff muscles?

Support and stabilise the shoulder joint.

20

What is the action and innervation of supraspinatus?

Abduction up to 15 degrees
Innervation is the suprascapular nerve

21

What is the action and innervation of infraspinatus?

Lateral arm rotation.
Innervation- suprascapular nerve

22

What is the action and innervation of teres minor?

Action- lateral rotation and weak adduction
Innervation- axillary nerve

23

What is the action and innervation of subscapularis?

Action- medial rotation.
Innervation- upper and lower subscapular nerve

24

What is the articulation of the shoulder joint?

The head of the humerus sits in the glenoid cavity, which is deepened by the glenoid labrum.

25

What type of joint is the shoulder joint?

A ball and socket synovial joint

26

Why is the shoulder joint unstable and commonly dislocated? (4)

-the glenoid cavity is shallow
-the movements of the joint are multi planar
-the capsule is lax
-the articulating surfaces are disproportionate.

27

How is stability of the shoulder joint achieved? (4)

-rotator cuff muscles
-other muscles
-ligaments
-capsule

28

Which way does the shoulder joint most commonly dislocate and why?

Inferiorly and anteriorly.
Because the inferior part of the capsule is the weakest as it is not reinforced by ligaments or the rotator cuff muscles.

29

What is the shoulder joint capsule?

A loose, fibrous layer.

30

Why is the capsule lax?

To allow full abduction of the arm

31

What are the five ligaments of the shoulder joint?

-glenohumeral- there are three of them (superior, middle and inferior) that move inferolaterally from the glenoid labrum-> humerus.
-coraco-acromial - between the acromion and coracoid process
-coraco-humeral - between the coracoid process and the greater tubercle
-transverse humeral - holds the long head of the biceps tendon in place during movement
-coraco-acromial arch - prevents upper displacement of the humeral head.

32

How is shoulder dislocation caused? (2)

-by excessive extension and lateral rotation
-trauma to a fully abducted arm

33

Which nerve can be injured during shoulder dislocation? What are the consequences?

The axillary nerve
Paralysis of the deltoid muscle and loss of sensation over the regimental patch area.

34

What is painful arc syndrome?

It is when the supraspinatous tendon rubs under to the coraco-acromial arch, causing irritation and inflammation of the tendon and subacromial bursa.

35

In painful arc syndrome, when is pain felt worst?

During 50-130 degree abduction

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