Msi Week 1: Arm And Elbow

Front 1

Which bony structure on the humerus contains the radial nerve and separates the origin of the lateral head of the triceps above and the origin of the medial head below?

Back 1

Spiral groove

Front 2

A fracture to the shaft of the humerus may injure which nerve and artery?

Back 2

Radial nerve
Deep brachial A
(both in spiral groove)

Front 3

A supracondylar fracture will most likely damage which nerve?

Back 3

Median N
(this kind of fracture occurs at the distal end of the humerus and is common in children)

Front 4

A fracture of the medial epicondyle of the humerus may damage which nerve?

Back 4

Ulnar N
(gets compressed in a groove behind the medial epicondyle, causing numbness = "funny bone")

Front 5

Which bony structure of the humerus marks the insertion of the deltoid muscle?

Back 5

Deltoid tuberosity

Front 6

Which bony structure of the humerus articulates with the trochlear notch of the ulna?

Back 6

Trochlea

Front 7

Which bony structure of the humerus articulates with the head of the radius?

Back 7

Capitulum

Front 8

Name the 4 carpal bones that make up the proximal row.

Back 8

1. Scaphoid
2. Lunate
3. Triquetrum
4. Pisiform

Front 9

Name the 4 carpal bones that make up the distal row.

Back 9

1. Trapezium
2. Trapezoid
3. Capitate
4. Hamate

Front 10

Fracture of the scaphoid may cause damage to which artery?

Back 10

Radial A

Front 11

Fracture of the hamate may injure which artery and nerve?

Back 11

Ulnar artery and nerve
(close proximity to hook of hamate)

Front 12

Which bones form the knuckles of the fist?

Back 12

Heads of metacarpals

Front 13

Which nerves supply the elbow joint?

Back 13

1. *Musculocutaneous N
2. *Radial N
3. Ulnar N
4. Median N
5. Anterior interosseous N

Front 14

Which bony structure of the humerus receives the coronoid process of the ulna?

Back 14

Coronoid fossa

Front 15

The radial tuberosity is an attachment for which muscle?

Back 15

Biceps brachii M

Front 16

The capitulum of the humerus articulates with which bony structure?

Back 16

Head of the radius

Front 17

Which muscle extends from the corocoid process of the scapula to the medial border of the humerus?

Back 17

Coracobrachialis M

Front 18

Describe the attachments of the biceps brachii M.

Back 18

Long head originates from supraglenoid tubercle
Short head originates from coracoid process of scapula
Inserts on radial tuberosity

Front 19

Which muscle originates on the distal half of the anterior surface of the humerus and inserts on the coronoid process of the ulna?

Back 19

Brachialis M.

Front 20

Which "neck" (surgical or anatomical) is found below the greater and lesser tuberosities of the humerus?

Back 20

Surgical neck

Front 21

Which nerve and artery are found along the radial groove of the humerus?

Back 21

Radial N
Deep Brachial A

Front 22

Which bony structure provides the distal attachment for the triceps brachii M?

Back 22

Olecranon (of the ulna)

Front 23

Which fossa is found superior to the capitulum of the anterior humerus?

Which fossa is found superior to the trochlea on the anterior humerus?

Back 23

Radial fossa

Coronoid fossa

Front 24

If a person is to take a hard fall onto an outstretched hand and experiences shoulder pain, what type of humeral fracture is most likely to occur?

Which joint does this involve?

Which nerve and artery are at risk for injury?

Back 24

Proximal humeral fracture

Involves glenohumeral joint

Axillary N and Circumflex humeral A are at risk

Front 25

Which nerves are at risk during a distal humeral fracture?

Back 25

Ulnar, Median, and Radial nerves are all at risk
(this injury involves the elbow-joint)

Front 26

Name the 3 ligaments of the elbow joint.

Which ligaments allow flexion/extension, and which allow pronation/supination?

Back 26

1. Ulnar (medial) collateral L--> flexion/extension
2. Radial (lateral) collateral L--> flexion/extension
3. Anular Ligament of radius--> pronation/supination

Front 27

Pain, swelling, and inflammation of the olecranon bursa is called...?

Back 27

Olecranon bursitis

Front 28

What general action do muscles of the anterior compartment of the arm perform?

How about muscles of the posterior compartment?

Back 28

Anterior (preaxial) --> flexion

Posterior (postaxial) --> extension

Front 29

Which nerve is found in the posterior compartment of the arm?

Which nerve is found in the anterior compartment of the arm?

Back 29

Posterior --> Radial N

Anterior --> Musculocutaneous N

Front 30

The short head of the biceps brachii M shares an attachment on the coracoid process with which other muscle?

Back 30

Coracobrachialis M

Front 31

Which aponeurosis covers the brachial A at the point where it splits into the Ulnar and Radial arteries?

Back 31

Bicipital aponeurosis

Front 32

Which head of the triceps brachii M is directly applied to the humerus?

Back 32

Medial head

Front 33

Describe the attachments of the triceps brachii M.

Back 33

Long head originates from infraglenoid tubercle
Lateral head originates from posterior surface of humerus (superior to radial groove)
Medial head originates from posterior surface of humerus (inferior to radial groove)
Inserts on proximal end of olecranon

Front 34

Which muscle extends from the lateral epicondyle of the humerus to the lateral surface of the olecranon and posterior surface of the ulna?

Back 34

Anconeus

Front 35

Which nerve(s) innervate the:
1. Biceps brachii
2. Coracobrachialis
3. Brachialis

Back 35

1. Biceps brachii --> Musculocutaneous N
2. Coracobrachialis --> Musculocutaneous N
3. Brachialis --> Musculocutaneous N AND Radial N

Front 36

Which nerve innervates the triceps brachii and anconeus muscles?

Back 36

Radial N

Front 37

Name the 3 branches of the Brachial artery.

Back 37

1. Deep brachial A (aka Profunda brachii)
2. Superior Ulnar collateral A
3. Inferior Ulnar collateral A

Front 38

Name the 3 branches of the Deep brachial A.

Back 38

1. Deltoid (ascending branch).
Terminal branches:
2. Radial collateral A
3. Medial collateral A

Front 39

Which superficial vein accompanies the medial antebrachial cutaneous nerve along the ulnar border of the forearm?

Back 39

Basilic vein

Front 40

What is the significance of the medial and lateral intermuscular septa?

Back 40

These septa divide the arm into the anterior (flexor) compartment and posterior (extensor) compartment.

Front 41

Name the 4 contents of the cubital fossa.

Back 41

1. Radial N
2. Biceps brachii tendon
3. Brachial A
4. Median N

(Ron Beats Bad Man)

Front 42

Which nerve branches from the C5 root of the brachial plexus and pierces through the middle scalene muscle?
(This nerve innervates the levator scapulae and rhomboid major/minor muscles).

Back 42

Dorsal scapular N (C5)

Front 43

Which nerve is a branch of C5-C7 roots of the brachial plexus and supplies the serratus anterior muscle?

Back 43

Long thoracic N

Front 44

Injury to which nerve produces a winged scapula?

Back 44

Long thoracic N

Front 45

Which nerve branches from the upper trunk of the brachial plexus and innervates the supraspinatus and infraspinatus muscles?

Back 45

Suprascapular N (C5-C6)

Front 46

Which nerve branches from the lateral cord of the brachial plexus and innervates the pectoralis major and minor muscles?

Back 46

Lateral pectoral N (C5-C7)

Front 47

Which nerve pierces the coracobrachialis muscle, descends between the biceps brachii and brachialis muscles, and innervates these 3 muscles?

Back 47

Musculocutaneous N (C5-C7)
(branch from lateral cord)

Front 48

Which nerve runs down the medial aspect of the arm but does not branch in the brachium?

Back 48

Ulnar N (C7-T1)

Front 49

Which nerve innervates the deltoid and teres minor muscles and gives rise to the lateral brachial cutaneous nerve?

Back 49

Axillary N

Front 50

Which nerve continues into the forearm as the lateral antebrachial cutaneous nerve?

Back 50

Musculocutaneous N (C5-C7)

Front 51

Injury to this nerve will result in weakness of lateral rotation and abduction of the arm.

Back 51

Axillary N

Front 52

Injury to this nerve will result in loss of function in the extensors of the forearm, hand, metacarpals, and phalanges. It also results in loss of wrist extension, leading to wrist drop.

Back 52

Radial N

Front 53

Injury to this nerve results in weakness of supination and forearm flexion.

Back 53

Musculocutaneous N

Front 54

Injury to this nerve may be caused by a supracondylar fracture of the humerus or a compression in the carpal tunnel.

Back 54

Median N

Front 55

Where does the Suprascapular A arise from and which arteries does it anastomose with?

Back 55

Arises from the Thyrocervical trunk.
Anastomoses with:
1. Deep branch of transverse cervical A (dorsal scapular A)
2. Circumflex scapular A

*provides collateral circulation around scapula

Front 56

Which artery supplies the Supraspinatus and Infraspinatus muscles?

Back 56

Suprascapular A

Front 57

At what point does the axillary artery become the brachial artery?

Back 57

After passing the teres major M.

Front 58

Is it possible to ligate the Axillary artery b/w the thyrocervical trunk and the subscapular artery and maintain proper circulation?

Back 58

YES.
Blood from anastomoses in the scapular region will arrive at the subscapular artery to reach the axillary artery distal to the ligature.

Front 59

In the cubital fossa, which structure lies medial to the biceps tendon and lateral to the median nerve?

Back 59

Brachial A

Front 60

Can sufficient blood flow be maintained if the brachial artery is tied off distal to the inferior ulnar collateral artery?

Back 60

YES.
The anastomoses around the elbow will maintain blood flow.
(Superior ulnar recurrent flows into posterior ulnar recurrent A;
Inferior ulnar recurrent flows into anterior ulnar recurrent A)