Anatomy: posterior shoulder and rotator cuff

Question 1

What are the movements of the posterior, middle and anterior fibres of the deltoid muscle?

Answer 1

Posterior: extension at shoulder

Middle: abduction

Anterior: flexion

Question 2

What are the movements coordinated by the ascending, middle and descending parts of the Trapezius?

Answer 2

Ascending (superior): scapular depression / rotation

Middle (horizontal): scapular retraction

Descending/Inferior: elevation/rotation

Question 3

Levator scapulae executes what movements? (2)

Answer 3

Elevates scapula

Inferior rotation of glenoid fossa

Question 4

Rhomboids _____ the scapula and _______ rotate the _____ ______

Answer 4

retract the scapula

inferiorly rotate the glonoid fossa

Question 5

What are the rotator cuff muscles (SITS)?

Answer 5

Supraspinatus
Infraspinatus
Teres Minor
Subscapularis

Question 6

What are the two movements carried out by teres major?

Answer 6

Adduction

Medial rotation at shoulder

Question 7

What three rotator cuf muscles insert distally at the greater tubercle of the humerus?

Answer 7

Suprasinatus
Infraspinatus
Teres minor

Question 8

What is the distal insertion of the Subscapularis?

Answer 8

lesser tubercle of the humerus

Question 9

The nerve supply of the rotator cuff muscles comes from the _____ _______

Answer 9

brachial plexus

Question 10

What is the cause of the ‘painful arc syndrome’? How does it present?

Answer 10

Inpingement of supraspinatus tendon between the humerus and the acromion process

Pain during 50-130o of abduction

Question 11

What is characteristically observed in patients with supraspinatus tear or paralysis during abduction of arm?

Answer 11

Abduction is initiated by throwing the upper limb to the side