8. Posterior Shoulder + Rotator Cuff

Question 1

Which muscles attach to the scapula and the humerus?

Answer 1

Deltoid
Trapezius
Levator Scapulae
Rhomboids (major&minor)
The rotator cuff muscles (SITS)

Question 2

List the muscles of the rotator cuff

Answer 2

Supraspinatus
Infraspinatus 
Teres minor 
Subscapularis
(SITS)

Question 3

What movement does the posterior part of deltoid facilitate?

Answer 3

Shoulder extension

Question 4

What movement does the acromial part of deltoid facilitate?

Answer 4

Shoulder abduction beyond 15degrees

Question 5

What movements does the levator scapulae facilitate?

Answer 5

Elevation of scapula

Inferior rotation of glenoid fossa

Question 6

What movements do the rhomboids facilitate?

Answer 6

Retraction of scapula

Inferior rotation of glenoid fossa

Question 7

What movement does supraspinatus facilitate?

Answer 7

First 15degrees of abduction at shoulder

Question 8

Which SITS muscles are responsible for lateral rotation of the shoulder?

Answer 8

Infraspinatus

Teres minor

Question 9

Which muscles are responsible for medial rotation of the shoulder?

Answer 9

Teres major

Subscapularis

Question 10

Which bones form the pectoral girdle?

Answer 10

Both clavicles and both scapulae

Question 11

Which other muscles attach to the pectoral girdle?

Answer 11

Pectoralis major
Pectoralis minor
Serratus anterior

Question 12

What is the role of the distal tendons of the rotator cuff muscles?

Answer 12

Reinforce and stabilise the fibrous capsule of the shoulder joint

Question 13

What is the distal attachment of the subscapularis?

Answer 13

Lesser tubercle of the humerus

Question 14

What is the distal attachment of the supraspinatus, infraspinatus and teres minor?

Answer 14

Greater tubercle of humerus

Question 15

What is the nerve supply to the rotator cuff muscles?

Answer 15

Branches of the brachial plexus

Question 16

What causes painful arc syndrome?

Answer 16

Impingement of supraspinatus tendon between the humerus and acromion process