Anatomy Dissection 10 - Posterior Shoulder and Rotator Cuff Muscles

Question 1

What are the 3 parts of the deltoid muscles?

Answer 1

Spinal Acromial Clavicular

Question 2

Action of the spinal part of the deltoid muscle?

Answer 2

Extension at the shoulder

Question 3

Action of the acromial part of the deltoid muscle?

Answer 3

Abduction at the shoulder (takes over from supraspinatus beyond 15 degrees)

Question 4

Action of the clavicular part of the deltoid muscle?

Answer 4

Flexion at the shoulder

Question 5

What are the 3 parts of the trapezius muscle?

Answer 5

Descending Middle Ascending

Question 6

Action of the ascending trapezius?

Answer 6

depression of the scapula

Question 7

Action of the middle trapezius?

Answer 7

Scapular retraction

Question 8

Action of the descending trapezius?

Answer 8

Scapular elevation

Question 9

what action occurs when the ascending and descending parts of the trapezius contracts?

Answer 9

Superior rotation of the glenoid fossa

Question 10

Action of the elevator scapulae?

Answer 10

Elevation of scapulae Inferior rotation of gleaned fossa

Question 11

Action of the rhomboid major?

Answer 11

Retraction of scapula Inferior rotation of glenoid fossa

Question 12

Action of the rhomboid minor?

Answer 12

Retraction of scapula Inferior rotation of glenoid fossa

Question 13

Name the 4 rotator cuff muscles?

Answer 13

Supraspinatus Infraspinatus Teres minor Subscapularis

Question 14

Action of supraspinatus?

Answer 14

First 15 degrees of adduction at shoulder

Question 15

Action of infraspinatus?

Answer 15

Stabilises head of humerus in glenoid Lateral rotation at shoulder

Question 16

Action of teres minor?

Answer 16

stabilises head of humerus in glenoid Lateral rotation at shoulder

Question 17

Action of subscapularis?

Answer 17

Stabilises head of humerus in glenoid Medial rotation at shoulder

Question 18

Action of teres major?

Answer 18

Adduction Medial rotation at shoulder

Question 19

When the upper limb is abducting, why is superior rotation of the glenoid fossa (by moving the scapula) required?

Answer 19

To prevent the greater tubercle of the humerus impinging on the accordion of the scapula

Question 20

What does the distal tendons of all the rotator cuff muscles blend with and reinforce?

Answer 20

The fibrous capsule of the shoulder joint

Question 21

What does the tendinous cuff of the shoulder joint help to do?

Answer 21

Stabilise the shallow ball and socket of the shoulder joitn

Question 22

Attachments of the rotator cuff muscles?

Answer 22

Scapula proximally Tubercles of the head of the humerus (all greater except subscapularis = lesser)

Question 23

Nerve supply of the rotator cuff muscle?

Answer 23

Branches of the brachial plexus

Question 24

What causes “painful arc syndrome”?

Answer 24

Impingement of supraspinatus tendon between the humerus and the accordion process

Question 25

What will patients with painful arc syndrome complain of?

Answer 25

Pain during 50 - 130 degrees of abduction

Question 26

What will a patient with supraspinatus paralysis/ tendon tear do to initiate abduction?

Answer 26

Throw their upper limb to the side

Question 27

What are the bones of the pectoral girdle?

Answer 27

Scapula Clavicle Manubrium of sternum

Question 28

What part of the clavicle is frequently fractured?

Answer 28

Middle third

Question 29

What is the most common rotator cuff injury?

Answer 29

Partial tear or complete rupture

Question 30

Name this muscle

Answer 30

Deltoid

Question 31

Name this muscle

Answer 31

Trapezius

Question 32

Name this muscle

Answer 32

Levator scapulae

Question 33

Name this muscle

Answer 33

Rhomboid major

Question 34

Name this muscle

Answer 34

Rhomboid minor

Question 35

Name this muscle

Answer 35

Teres Major

Question 36

Name this muscle

Answer 36

Supraspinatus

Question 37

Name this muscle

Answer 37

Infraspinatus

Question 38

Name this muscle

Answer 38

Teres minor

Question 39

Name this muscle

Answer 39

Subscapularis