Lecture 6- Shoulder

Question 1

Name the four muscles of the rotator cuff muscles

Answer 1

S: Supraspinatus
I: Inraspinatus
T: Teres Minor
S: Subscapularis

Question 2

What is the average ROM for shoulder flexion?

Answer 2

0-180 degrees

Question 3

What is the average ROM for shoulder extension

Answer 3

0-60 degrees

Question 4

What is the average ROM for shoulder abduction?

Answer 4

0-180 degrees

Note: external rotation permits 180 degrees of abduction; Internal rotation limits abduction to 90 degrees

Question 5

What is the average ROM for shoulder external rotation?

Answer 5

0-90 degrees

Question 6

What is the average ROM for shoulder internal rotation?

Answer 6

0-70 degrees

Question 7

Flexion of humerus makes the scapula do what?

Answer 7

upward rotation and abduction

Question 8

Extension of humerus makes scapula do what?

Answer 8

downward rotation and adduction

Question 9

Hyperextension of humerus makes scapula do what?

Answer 9

elevation, upward tilt, adduction, downward rotation

Question 10

Abduction of humerus makes scapula do what?

Answer 10

upward rotation

Question 11

Adduction of humerus makes scapula do what?

Answer 11

downward rotation

Question 12

External rotation of humerus makes scapula do what?

Answer 12

adduction

Question 13

Internal rotation of humerus makes scapula do what?

Answer 13

abduction

Question 14

Horizontal adduction of humerus makes scapula do what?

Answer 14

abduction

Question 15

Horizontal abduction of humerus makes scapula do what?

Answer 15

adduction

Question 16

T/F: when the arm is raised, stability is more dependent upon ligamentous support than it is upon muscular action

Answer 16

False - much more dependent on muscular support

Question 17

T/F: The deltoid and the scapula do not have a close relationship

Answer 17

False - scapula and deltoid have a very close relationship

Question 18

T/F: The action of the deltoid is very dependent upon scapular rotation to insure that this compression is functional and does not cause impingement of the head of the humerus against its overlying structures

Answer 18

True

Question 19

Prime more for shoulder flexion and horizontal adduction

Answer 19

anterior deltoid

Question 20

Prime mover for abduction and horizontal abduction

Answer 20

middle deltoid

Question 21

Prime mover for horizontal abduction

Answer 21

posterior deltoid

Question 22

Acts together with deltoid as a prime more for abduction

Answer 22

supraspinatus

Question 23

The ___1__ is powerful enough to begin abduction of the humerus. The __2__ takes over after about 60 degrees of abduction as the primary although the 1 remains active

Answer 23

1. supraspinatus

2. deltoid

Question 24

This muscle comes into play when carrying a heavy load

Answer 24

supraspinatus

Question 25

One of the rotator cuff muscles and performs an important stability function at the glenohumeral joint helping to stabilize the shoulder as it is rotation

Answer 25

supraspinatus

Question 26

Two rotator cuff muscles that are nicknamed the “IT” muscles because of their identical functions

Answer 26

Infraspinatus and teres minor

Question 27

Name the two prime movers for horizontal abduction and external rotation

Answer 27

Infraspinatus and teres minor

Question 28

Name the two muscles that provide muscular reinforcement of the joint capsule and assists in holding head of humerus into glenoid fossa

Answer 28

Infraspinatus and teres minor

Question 29

These two muscles along with the subscapularis depress the head of the humerus preventing it from jamming into the acromion during flexion and abduction of the arm

Answer 29

Infraspinatus and teres minor

Question 30

prime mover for internal rotation of the humerus; provides the greatest range of motion

Answer 30

Subscapularis

Question 31

These three muscles perform the important function of depressing the head of the humerus so that the greater tubercle moves underneath the acromion, thereby allowing full flexion and abduction

Answer 31

ITS - Infraspinatus and teres minor and subscapularis

Question 32

Prime mover for extension and adduction of the humerus especially when the arm is raised between 30 and 90 degrees; also assists with horizontal abduction

Answer 32

Latissimus dorsi

Question 33

This muscle produces the same motions as the latissimus dorsi

Answer 33

teres major

Question 34

Prime mover for extension, adduction, and internal rotation

Answer 34

teres major

Question 35

The clavicular portion of this muscle lies very close to the anterior deltoid and acts with it as a prime mover for flexion and horizontal adduction

Answer 35

pectoralis major

Question 36

the sternal portion of this muscle produces adduction and horizontal adduction; it is also a prime mover for extension when the arm begins in a position of flexion

Answer 36

pectoralis major

Question 37

Prime mover for horizontal adduction

Answer 37

coracobrachialis

Question 38

This muscle is important because it often substitutes for important shoulder motions

Answer 38

biceps

Question 39

One of the heads of this muscle crosses over the shoulder joint to insert on the scapula just below the glenoid fossa on a bony protrustion call the infraglenoid tubercle; due to this positioning, it assists with extension and adduction of the humerus

Answer 39

Triceps

Question 40

These three muscles provide a force couple that allows pain free rotation of the humeral head in the glenoid fossa

Answer 40

ITS - Infraspinatus, teres minor, and subscapularis

Question 41

The action of the ___ along with the combined actions of the infraspinatus, teres minor, and subscapularis form a force couple

Answer 41

deltoid