Shoulder Joint Complex

Question 1

What bone secures the UE to the axial skeleton?

Answer 1

manubrium

Question 2

What is the s shaped bone that acts as a strut and transmits forces from the upper limb to the axial skeleton?

Answer 2

clavicle

Question 3

This medial 2/3 part of the clavicle has a forward convexity.

Answer 3

sternal end

Question 4

This lateral 1/3 of the clavicle has a forward concavity.

Answer 4

acromial endh

Question 5

What is the most commonly fractured bone in the body?

Answer 5

clavicle

Question 6

What type of acromion process at the scapula is most likely to cause a shoulder impingement?

Answer 6

Type 3 (hooked)

Question 7

What type of acromion process at the scapula is most common?

Answer 7

Type 2 (curved)

Question 8

The posterior surface of the scapula is divided into these 2 parts.

Answer 8

supraspinous fossa and infraspinous fossa

Question 9

The inferior angle of the scapula is at this vertebral level.

Answer 9

T7

Question 10

The greater and lesser tuberosities of the humerus is separated by __________

Answer 10

bicipital groove

Question 11

What groove found at the humerus accommodates the radial nerve?

Answer 11

spiral groove

Question 12

It is pulley shaped and articulates with the trochlear notch of the ulna.

Answer 12

trochlea

Question 13

What is the most flexible joint in the body?

Answer 13

glenohumeral joint

Question 14

Why does only 1/3 of the humeral head articulate with the glenoid cavity?

Answer 14

higher flexibility but low stability

Question 15

What are the 4 ligaments that aid the stability of the glenoid cavity?

Answer 15

1. coracohumeral lig.
2. coracoacromial lig.
3. corcacoclavicular lig.
4. acromioclavicular lig.

Question 16

What is the fibrocartilaginous ring that aids in the stability of the humeral head to the glenoid cavity? (hint: pushes it in by 50% + suction effect)

Answer 16

glenoid labrum

Question 17

What ligament keeps the shoulder in place if the humerus is pulled down?

Answer 17

coracohumeral ligament

Question 18

What is the function of the coracoacromial ligament?

Answer 18

keeps the shoulder joint down when it pushes upward (because of force)

Question 19

What ligament anchors down the clavicle?

Answer 19

coracoclavicular ligament

Question 20

What connects the clavicle to the acromial process and subsequently scapula?

Answer 20

scapula

Question 21

C5 Root is associated with what myotome (movement)?

Answer 21

abduction

Question 22

C6 Root is associated with what myotome (movement)?

Answer 22

flexion of elbow

Question 23

C7 Root is associated with what myotome (movement)?

Answer 23

extension of elbow

Question 24

What nerve innervates the supraspinatus and infraspinatus muscle?

Answer 24

suprascapular nerve

Question 25

What innervates the teres minor m.?

Answer 25

axillary nerve

Question 26

What innervates the triceps and forearm extensor muscles?

Answer 26

radial nerve (mainly posterior of arm + hand)

Question 27

What innervates the biceps and brachialis?

Answer 27

musculocutaneous nerve

Question 28

What innervate the forearm flexors and thenar m.?

Answer 28

median neve