Shoulder (Week 8)

Question 1

GHJ Contractile structures that limit
excessive movement

Answer 1

Rotator cuff muscles
Dynamic ligaments

Question 2

GHJ Non-Contractile structures that limit
excessive movement

Answer 2

Glenoid labrum
Ligaments

Question 3

Glenoid Labrum function

Answer 3

• Deepens socket
• Limit accessory movement
• Increases congruency of GHJ
• Attachment for long head of biceps
  at the superior edge
• Labrum can be torn in dislocations
  or from biceps traction
• 59% of 1st time GHJ dislocations will
  include a Bankart lesion (anterior
  tear to labrum)

Question 4

GLENOHUMERAL Ligament functions

Answer 4

• Thickenings of
  capsule
• Limits anterior
  accessory movt
  in external
  rotation
• IGHL anterior in
  a stop sign
  position

Question 5

Coracohumeral ligament Function

Answer 5

Resists weight of arm
Keeps ball in socket

Question 6

Transverse humeral ligament Function

Answer 6

Converts intertubercular sulcus
into the bicipital tunnel.
Prevents bowstring of biceps
tendon
Holds synovial sheath around
biceps in place

Question 7

Deltoid Att.

Answer 7

P: 3 heads
1. lateral 1/3 clavicle (anterior),
2. acromion (middle),
3. scapula spine (posterior)
D: deltoid tuberosity of humerus

Question 8

Deltoid A/NS

Answer 8

Action: ABD (strong), FL, EXT GHJ
Function: resist downward weight of arm.
NS: Axillary Nerve

Question 9

Rotator Cuff Muscles/Functions

Answer 9

Subscapularis
Supraspinatus
Infraspinatus
Teres minor

STABILISE THE HUMERAL HEAD
IN THE GLENOID FOSSA
BALANCE DELTOID FORCES

Question 10

Supraspinatus Att

Answer 10

P: supraspinous fossa
D: greater tubercle of humerus (superior)

Question 11

Supraspinatus A/NS

Answer 11

Action: initiates & assists ABD in GHJ
Function: stabilise head of humerus in glenoid
fossa
NS: Suprascapular nerve

Question 12

Infraspinatus Att

Answer 12

P: infraspinous fossa
D: greater tubercle of humerus (middle)

Question 13

Infrapsinatus A/NS

Answer 13

Action: external rotation of GHJ
Function: stabilise head of humerus in
glenoid fossa
NS: Suprascapular nerve

Question 14

Teres Minor Att.

Answer 14

P: middle part lateral border scapula
D: greater tubercle of humerus (inferior)

Question 15

Teres Minor A/NS

Answer 15

Action: external rotation of GHJ
Function: stabilise head of humerus in
glenoid fossa
NS: Axillary nerve

Question 16

Supscapularis Att.

Answer 16

P: subscapular fossa
D: lesser tubercle of humerus

Question 17

Subscapularis A/NS

Answer 17

Action: medial rotation of GHJ
Function: stabilise head of humerus
in glenoid fossa
NS: upper and lower subscapular nerve

Question 18

Teres Major Att.

Answer 18

P: posterior surface of inferior angle of scapula
D: medial lip intertubercular sulcus of humerus

Question 19

Teres Major A/NS

Answer 19

Action: ADD & medial rotation of GHJ
NS: Lower subscapular nerve (C5-6)

Question 20

Axillary Nerve Source

Answer 20

C5-6

Question 21

Axillary Nerve Course

Answer 21

From the cord of the brachial plexus
Lateral to radial nerve, posterior to the
axillary artery
Passes into the axilla
Passes through quadrangular space
Curves around the neck of the
humerus

Question 22

Axillary Nerve Motor Supply

Answer 22

Teres minor
Deltoid

Question 23

Axillary Nerve Sensory Supply

Answer 23

patch over Deltoid laterally

Question 24

Biceps Brachii Att.

Answer 24

Proximal:
Long head: supraglenoid tubercle of
the scapula
Short head: coracoid process of
scapula
Distal: radial tuberosity

Question 25

Biceps Brachii A/NS

Answer 25

Action: forearm supination and elbow flexion; shoulder flexion NS: musculocutaneous nerve

Question 26

Coracobrachilais Att.

Answer 26

P: coracoid process of scapula D: medial surface of humerus

Question 27

Coracobrachialis A/NS

Answer 27

Action: shoulder flexion and adduction NS: musculocutaneous nerve

Question 28

Brachialis Att.

Answer 28

P: anterior surface of distal humerus D: coronoid process and ulnar tuberosity

Question 29

Brachialis A/NS

Answer 29

Action: elbow flexion NS: musculocutaneous and radial nerve

Question 30

Musculocutaneous Nerve Source

Answer 30

C5-7

Question 31

Musculocutaneous Nerve Course

Answer 31

Arises from cord of brachial plexus Pierces coracobrachialis and descends laterally between biceps brachii and brachialis at the lateral arm Pierces the deep fascia in the cubital fossa lateral to the tendon of biceps brachii Continues as the lateral cutaneous nerve of the forearm

Question 32

Musculocutaneous Nerve Motor Supply

Answer 32

- biceps brachii – brachialis – coracobrachialis

Question 33

Musculocutaneous Nerve Sensory Supply

Answer 33

– lateral cutaneous nerve of the forearm