Chapter 5

Question 1

How is the shoulder joint attached?

Answer 1

Via the clavicle at SC joint

Question 2

Glenohumeral joint

Answer 2

multiaxial ball and socket

Enarthrodial

Question 3

Range of motion of glenohumeral

Answer 3

90 degrees abduction
0-75 adduction 
40-60 extension 
90-100 flexion 
70-90 rotation

Question 4

Why is the glenohumeral joint frequently injured?

Answer 4

shallowness of glenoid fossa 
lack of strength of muscles
instabilty issues 
labrum 
short small muscles

Question 5

What are the muscles that make up rotator cuff? (SITS)

Answer 5

Subscapularis, supraspinatus, infraspinatus and teres minor

Question 6

Why is rotator cuff frequently injured?

Answer 6

attaches to top, front, rear of head.
Not much room for all muscles
Some hook on edge of acromion, can cause tears

Question 7

Anterior muscles of shoulder:

Answer 7

Pect major
Coracobrachialis
Subscapularis

Question 8

Superior muscles of shoulder:

Answer 8

Deltoid and supraspinatus

Question 9

posterior muscles of shoulder:

Answer 9

latissuimus dorsi
Teres major
Infraspinatus
Teres minor

Question 10

All shoulder joints are innervated from?

Answer 10

Brachial plexus

Question 11

Pectoral Major- origin, insertion, nerve and action

Answer 11

0: medial 1/2 clavicle, costal cartilage first 6 ribs
I: lateral lip of interrtubercular groove
N: medial and lateral pectoral n.
A: internal rotation, adduction and horizontal adduction

Question 12

Latissium Dorsi- origin, insertion, nerve and action

Answer 12

O: posterior ilium, spinous process of sacrum to T6.
I: floor of intertubercular groove
N: theracodorsal nerve
A: adduction, internal rotation, extension

Question 13

Teres major

Answer 13

O: inferior angle of scapula,
I: medial lip of intertubercular groove
N: lower subscapular nerve
A: adduction, internal rotation, extension

Question 14

Deltoid

Answer 14

O: lateral 1/3 of clavicle, acromion, spine of scapula
I: deltoid tuberosity
N: axillary nerve
A: anterior-flexion, middle- abduction, posterior-extension

Question 15

Coracobrachialis

Answer 15

O: coracoid process
I: middle 1/3 or humerus
N: musculocutaneous
A: flexion

Question 16

What is a synergist of Coracobrachialis?

Answer 16

Anterior deltoid

Question 17

Which two muscles externally rotate glenohumeral joint?

Answer 17

Infraspinatus and teres minor.

Question 18

Subscapularis

Answer 18

O: subscapular fossa
I: lesser tubercle
N: upper and lower subscapular nerve
A: internal rotation

Question 19

Supraspinatus

Answer 19

O: supraspinatus fossa
I: greater tubercle
N: suprascapular nerve
A: abduct for 30 degrees (deltoid

Question 20

Infraspinatus

Answer 20

O:infraspinatus fossa
I: greater tubercle
N: suprascapular nerve
A: lateral external rotation

Question 21

Teres minor

Answer 21

O: lateral border or scapula
I: greater tubercle
N: axillary
A: lateral extension rotation

Question 22

3 muscles that insert into greater tubercle:

Answer 22

teres minor, infraspinatus and supraspinatus

Question 23

Synergists to Coracobrachialis in flexion is:

Answer 23

anterior deltoid, and

Question 24

In the action of abduction the synergist to middle deltoid is:

Answer 24

superspinatus

Question 25

synergist to lat dorsi in adduction

Answer 25

teres minor

Question 26

Synergist of pec minor in depression

Answer 26

lower trap

Question 27

Muscles that adduct and internally rotate is

Answer 27

pec major, lat dorsi, teres major

Question 28

muscles innervated by axillary nerve:

Answer 28

deltoid, teres minor

Question 29

Muscles that adduct gleno joint?

Answer 29

supraspinatus, middle deltoid

Question 30

rhomboid insertion

Answer 30

medial border of scapula