Msi Week 1: Forearm And Cubital Fossa

Front 1

The Median N innervates all muscles of the anterior forearm except 1 1/2. Name these exceptions.

Back 1

1. Flexor carpi ulnaris M --> Ulnar N
2. 1/2 of Flexor digitorum profundus ---> Ulnar N

Front 2

The Ulnar N innervates all muscles of the hand except 1 1/2 groups. Name these exceptions.

Back 2

Median N innervates:
1. Muscles of thenar eminence
2. First two lumbricals

Front 3

Which nerve innervates ALL extensor muscles of the forearm and one flexor (brachioradialis)?

Back 3

Radial N

Front 4

Name the two branches of the radial nerve and the structures that they supply.

Back 4

1. Superficial branch --> cutaneous to back of lateral hand
2. Deep branch --> motor to the extensor muscles of forearm

Front 5

T or F.

Radial N innervates NO muscles below the forearm.

Back 5

TRUE.

Front 6

Medial and lateral collateral ligaments attach to which bony features on the radius and ulna?

Back 6

Styloid processes of both bones

Front 7

Name the 4 carpal bones in the proximal row.

Back 7

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

Front 8

Name the 4 carpal bones in the distal row.

Back 8

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

Front 9

Which bones articulate with the distal row of carpal bones?

Back 9

Metacarpals

Front 10

Which metacarpal articulates with the trapezium?

Back 10

1st metacarpal (thumb)

Front 11

Which metacarpal articulates with the trapezoid bone?

Back 11

2nd metacarpal (index finger)

Front 12

Which metacarpal articulates with the capitate bone?

Back 12

3rd metacarpal (middle finger)

Front 13

Which metacarpals articulate with the hamate?

Back 13

4th and 5th metacarpals

Front 14

Which digits are best supported by metacarpals?

Back 14

2nd and 3rd
(unlike the 4th and 5th metacarpals, the 2nd and 3rd metacarpals have individual articulations with carpal bones. The 4th and 5th metacarpals share an articulation with the hamate, making them weaker)

Front 15

Which carpal bone is a sesamoid bone (exists within a tendon of muscle)?

Which tendon is found within?

Back 15

Pisiform

Found in tendon of flexor carpi ulnaris M.

Front 16

What membrane is found between the radius and ulna?

In which direction do these fibers travel?

Back 16

Interosseous membrane

Fibers travel in superior-->inferior direction from lateral-->medial side.

Front 17

Name the membrane that is triangular in shape and covers the head of the ulna, connecting it to the radius and separating it from the carpal bones.

Back 17

Triangular disc (ulnar disc)

Front 18

What type of fracture occurs above the medial and lateral epicondyles of the humerus?

Back 18

Supracondylar fracture
(this area of the humerus is weak due to the coronoid and olecranon fossas)

Front 19

The flexor muscles of the forearm all originate from which bony structure?

Back 19

Medial epicondyle of humerus

Front 20

The extensor muscles of the forearm all originate from which bony structure?

Back 20

Lateral epicondyle of humerus

Front 21

How can a fractured radial neck injury be fixed?

Back 21

Don't do anything to fix this fracture! You want to maintain mobility of the joint, so leave it alone!

Front 22

Which artery and nerve will be found in the medial part of the anterior compartment of the forearm?

Back 22

Ulnar artery and nerve

Front 23

Which artery and nerve will be found in the lateral part of the anterior compartment of the forearm?

Back 23

Superficial branch of Radial N
Radial A

Front 24

Which nerve is found in the middle of the anterior compartment of the forearm?

Back 24

Median N

Front 25

Which structure separates the anterior and posterior compartments of the forearm?

Back 25

Interosseous membrane

Front 26

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

Back 26

Deep branch of Radial N

Front 27

Name 5 superficial muscles of the anterior forearm.

Back 27

1. Pronator teres
2. Flexor carpi radialis
3. Palmaris longus
4. Flexor digitorum superficialis
5. Flexor carpi ulnaris

Front 28

Name the attachments of the flexor digitorum superficialis M.

Back 28

1. Common flexor tendon (medial epicondyle of humerus) and radius
2. Middle phalanx (flexes PIP)

Front 29

Which 2 muscles create the Median tunnel (passage for Median N and Ulnar A)?

Back 29

1. Flexor digitorum superficialis
2. Pronator teres

Front 30

Deep muscles of the forearm are in contact with which membranous structure?

Back 30

Interosseous membrane

Front 31

Name 2 muscles that contact the anterior surface of the interosseous membrane?

Back 31

1. Flexor pollicis longus
2. Flexor digitorum profundus

Front 32

Name the 3 deep muscles of the anterior forearm.

Back 32

1. Flexor pollicis longus
2. Flexor digitorum profundus
3. Pronator quadratus

Front 33

Which joint is flexed by the flexor digitorum profundus?

Back 33

Distal interphalangeal joint (DIPJ)

(*Remember the flexor digitorum superficialis flexes the PIPJ)

Front 34

What test should you perform to check the collateral circulation of the hand?

Which arteries form this circulation?

Back 34

Allan's test

Radial and Ulnar arteries

Front 35

Which artery sits next to the pisiform bone?

Back 35

Ulnar A

Front 36

Name the 3 extensors in the forearm that operate the thumb.

Back 36

1. Abductor pollicis longus
2. Extensor pollicis brevis
3. Extensor pollicis longus

Front 37

Name the 3 extensors in the forearm that operate the digits.

Back 37

1. Extensor inidicis
2. Extensor digiti minimi
3. Extensor digitorum

Front 38

Name the 3 extensors in the forearm that operate the wrist.

Back 38

1. Extensor carpi radialis longus
2. Extensor carpi radialis brevis
3. Extensor carpi ulnaris

Front 39

Which nerve innervates all the superficial and deep extensor muscles?

Back 39

Deep branch of the Radial N

Front 40

What sheath covers the tendons of the extensor muscles in the forearm?

Back 40

Extensor retinaculum

Front 41

Name the borders of the anatomical snuffbox.

Back 41

1. Extensor pollicis longus
2. Extensor pollicis brevis/Abductor pollicis longus

Front 42

What artery is found in the anatomical snuffbox?

Back 42

Radial A

Front 43

Name 3 branches of the Ulnar artery.

Back 43

1. Anterior ulnar recurrent A
2. Posterior ulnar recurrent A
3. Common interosseous A

Front 44

What does the Basilic vein dive into to help form the Brachial V?

Back 44

Medial intermuscular septum

Front 45

Describe the boundaries of the cubital fossa.

Back 45

Brachioradialis and lateral epicondyle
Pronator teres and medial epicondyle
Roof = Bicipital aponeurosis
Floor = brachialis and supinator

Front 46

Name 6 contents of the cubital fossa.

Back 46

1. Bicepts tendon
2. Brachial A bifurcation
3. Median N
4. Radial N
5. Ulnar A and branches
6. Radial A and branches

Front 47

What is a torus fracture?

Back 47

Buckle fracture of radius

Front 48

A fracture that results in a dorsal displacement of the radius is called...?

Back 48

Colle's fracture

Front 49

A fracture that results in a ventral displacement of the radius is called...?

Back 49

Smith's fracture

Front 50

If you find the styloid processes of the ulna and radius aligned in an x-ray, should you be concerned?

Back 50

YES.
An alignment of the styloid processes indicates a fracture.

Front 51

If a patient has experienced trauma to the hand and has continuing pain with tenderness over the snuff box, what type of injury would you consider?

Back 51

Avascular necrosis of the scaphoid

Front 52

Name the channel through which the Ulnar nerve travels over the elbow.

Back 52

Cubital tunnel

Front 53

Inflammation of the lateral epicondyle is known as....?

Back 53

Lateral epicondylitis
"tennis elbow"

Front 54

Inflammation of the medial epicondyle is known as...?

Back 54

Medial epicondylitis
"golfer's elbow"

Front 55

Which nerve and artery supply the deep muscles of the anterior forearm?

Back 55

Anterior interosseous N, A

Front 56

Which nerve innervates all of the superficial extensor muscles?

Back 56

Deep branch of Radial N