Shoulder Joint, Rotator Cuff And Shoulder Musculature

Question 1

What is the ball and socket of the shoulder joint?

Answer 1

Ball - Head of humerus
Socket - Glenoid cavity

Question 2

What is the rim of cartilage surrounding the socket?

Answer 2

Glenoid labrum

Question 3

What is the function of the Glenoid labrum (cartilage)?

Answer 3

Provides a better fit for the head of the humerus
Shock absorption
Joint lubrication
Attachment site for ligaments and tendons

Question 4

What do bursae do?

Answer 4

Provide cushioning around joints via their synovial fluid filled interior.

Question 5

What are the 2 main bursae in the shoulder?

Answer 5

Subacromial bursa
Subscapular bursa

Question 6

Which bursa communicates with the joint cavity?

Answer 6

The subscapular bursa.

Question 7

What is the role of subacromial bursa?

Answer 7

Reduces friction
Facilitates smooth movement within shoulder joint.

Question 8

What common sporting injury damages the subacromial bursa?

Answer 8

Shoulder impingement syndrome

Question 9

What is the proximal attachment of the Serratus anterior?

Answer 9

Medial 2/3 of costal aspect of scapula

Question 10

What is the distal attachment of the Serratus anterior?

Answer 10

Anterior surface of medial scapula.

Question 11

What is the movement of the shoulder joint from the Serratus anterior?

Answer 11

Protraction, upward rotation.

Question 12

What is the proximal attachment of supraspinatus muscle?

Answer 12

Supraspinous fossa or scapula.

Question 13

What is the distal attachment of the supraspinatus muscle?

Answer 13

Supraspinous fossa of scapula

Question 14

What is the distal attachment of the supraspinatus muscle?

Answer 14

Greater tuberosity of the humerus.

Question 15

What is the movement of the shoulder joint from the supraspinatus muscle?

Answer 15

Initiates abduction

Question 16

What is the proximal attachment of the infraspinatus muscle?

Answer 16

Infraspinous fossa of scapula

Question 17

What is the distal attachment of the infraspinatus muscle?

Answer 17

Greater tuberosity of humerus

Question 18

What is the movement of the shoulder joint of the infraspinatus muscle?

Answer 18

External rotation

Question 19

What is the proximal attachment of the teres minor muscle?

Answer 19

Lateral border of the scapula

Question 20

What is the distal attachment of the teres minor muscle?

Answer 20

Greater tuberosity of the humerus

Question 21

What is the movement of the shoulder joint of the teres minor muscle?

Answer 21

External rotation

Question 22

What is the primary function of the rotator cuff muscles?

Answer 22

Stabilization of the glenohumeral joint.

Question 23

What is the action of the anterior fibers of the deltoid?

Answer 23

Flex and medically rotate at the shoulder joint

Question 24

What is the action of the middle fibers of the deltoid?

Answer 24

Abduct the arm at the shoulder joint

Question 25

What is the action of the posterior fibers of the deltoid?

Answer 25

Extend and laterally rotate at the shoulder joint

Question 26

What is the nerve supply to the deltoid?

Answer 26

Axillary nerve (C5, 6)

Question 27

What is the distal attachment of the Pectoralis major?

Answer 27

Lateral lip of the bicipital groove of the humerus

Question 28

What is the action of the Pectoralis major?

Answer 28

Medically rotate the humerus at the shoulder joint

Question 29

What is the action of the superior fibers of the trapezius?

Answer 29

Elevate the scapula

Question 30

What is the action of the middle fibers of the trapezius?

Answer 30

Retract the scapula

Question 31

What is the action of the inferior fibers of the trapezius?

Answer 31

Depress the scapula

Question 32

What muscles are responsible for flexion of the shoulder?

Answer 32

Anterior deltoid Pectoralis major Coracobrachialis

Question 33

What muscles are responsible for extension of the shoulder?

Answer 33

Posterior deltoid Latissimus dorsi

Question 34

What muscles are responsible for addiction of the shoulder?

Answer 34

Pectoralis major Latissimus dorsi Teres major Coracobrachialis

Question 35

What muscles are responsible for abduction of the shoulder (0-90°)?

Answer 35

Supraspinatus Middle deltoid

Question 36

What muscles are responsible for abduction of the shoulder (90-180°)?

Answer 36

Trapezius Serratus anterior

Question 37

What muscles are responsible for medial or internal rotation of the shoulder?

Answer 37

Subscapularis Latissimus dorsi Pectoralis major Teres major

Question 38

What muscles are responsible for lateral or external rotation of the shoulder?

Answer 38

Infraspinatus Teres minor Posterior deltoid