Upper Extremities Part 2: The Forearm

Question 1

What types of muscles are located in the anterior compartment of the forearm?

Answer 1

Flexors
Pronators

Question 2

What two nerves innervate the anterior compartment of the forearm?

Answer 2

Median
Ulnar

Question 3

What types of muscles are contained in the posterior compartment of the forearm?

Answer 3

Extensors
Supinators

Question 4

What nerve innervates the posterior compartment of the forearm?

Answer 4

Radial

Question 5

The interosseous membrane of the forearm connects the radius and the ulna. What passes through here anterior to posterior?

Answer 5

Anterior Interosseous Artery

Question 6

Name the Superficial Wrist Flexors.

Answer 6

Flexor Carpi Ulnaris
Flexor Carpi Radialis
Palmaris Longus
Pronator Teres

Question 7

The muscles in the deep layer of the anterior compartment of the forearm allow for what?

Answer 7

Wrist and Finger Flexion and Pronation

Question 8

What is the largest muscle of the Deep Anterior Compartment of the forearm and flexes the MCP and PIP joint of 4 fingers?

Answer 8

Flexor Digitorum Superficialis

Question 9

What is the only muscle that can flex the DIP joint of the fingers and is needed for a strong grip?

Answer 9

Flexor Digitorum Profundus

Question 10

What muscles allows for flexion of the thumb?

Answer 10

Flexor Pollicis Longus

Question 11

What muscle is the prime mover of pronation but recruits pronator teres when speed and power are needed?

Answer 11

Pronator Quadratus

Question 12

Fascial compartment generally ends at the joints, thus containing the spread of infection and fluids. Except the anterior compartment has communication with the central compartment of the palm via what?

Answer 12

Carpal Tunnel

Question 13

Muscles that flexes and abducts the hand at the wrist. Is also used as a guide to the radial artery. (Radial artery lies lateral to this muscle)

Answer 13

Flexor Carpi Radialis

Question 14

Muscle that is absent in 14% of the population. Serves as guide for the median nerve. (Lies deep and slightly medial to the median nerve)

Answer 14

Palmaris Longus

Question 15

Muscle that is a guide for the Ulnar nerve and Ulnar artery which are lateral to the tendon at the wrist.

Answer 15

Flexor Capri Ulnaris

Question 16

How many muscles are located in the anterior compartment of the forearm?

Answer 16

8

Question 17

How many muscles are located in the posterior compartment of the forearm?

Answer 17

11

Question 18

What holds the muscles in place in the Anterior Compartment of the Forearm?

Answer 18

Palmar Carpal Ligament
Flexor Retinaculum

Question 19

Why are the flexors in the anterior compartment of the forearm more massive than the extensors?

Answer 19

They work against gravity

Question 20

What holds the tendons in place in the posterior compartment of the forearm?

Answer 20

Extensor Retinaculum

Question 21

What nerve innervates the posterior compartment of the forearm?

Answer 21

Radial Nerve

Question 22

Name the superficial extensors of the forearm in the posterior compartment.

Answer 22

Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Digitorum
Extensor Digiti Minimi
Extensor Carpi Ulnaris

Question 23

What three muscles make of the “Mobile Wad of Henry”

Answer 23

Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis

Question 24

What muscle of the superficial posterior compartment of the forearm is actually a flexor of the elbow?

Answer 24

Brachioradialis

Question 25

What two muscles of the superficial posterior compartment of the forearm abduct and extend the wrist?

Answer 25

Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis

Question 26

What muscle may be fused with the Extensor Digitorum Minimi

Answer 26

Extensor Digitorum

Question 27

What muscle of the superficial posterior compartment of the forearm adduct and extend the wrist?

Answer 27

Extensor Carpi Ulnaris

Question 28

What condition is the result forth repetitive use of the superficial extensor muscles?

Answer 28

Lateral Epicondylitis
(Tennis Elbow)

Question 29

What are the muscles of the deep posterior compartment of the forearm?

Answer 29

Supinator
Abductor Pollicis Longus
Extensor Pollicis Longus
Extensor Pollicis Brevis
Extensor Indices

Question 30

What muscle of the deep posterior compartment of the forearm extends all joints of the thumb?

Answer 30

Extensor Pollicis Longus

Question 31

What muscle of deep posterior compartment of the forearm extends at the MCP and CMP joints in the thumb?

Answer 31

Extensor Pollicis Brevis

Question 32

What muscle of the deep posterior compartment of the forearms abducts the thumb?

Answer 32

Abductor Pollicis Longus

Question 33

What muscle allows the index finger to be independent of other fingers during extension?

Answer 33

Extensor Indicies

Question 34

What other muscle does supination of the hand other than the Supinator?

Answer 34

Biceps Brachii

Question 35

What landmarks make up the Cubital Fossa?

Answer 35

Medial Epicondyle
Pronator Teres
Brachioradialis

Question 36

What 2 tendons form the anatomical snuff box?

Answer 36

Extensor Pollicis Brevis (Palmar)
Extensor Pollicis Longus (Dorsal)

Question 37

Location where both the Ulnar Artery and Ulnar Nerve pass through.

Answer 37

Guyon’s Canal
(Ulnar Tunnel)

Question 38

What happens if the median nerve is compressed at the wrist?

Answer 38

Carpal Tunnel Syndrome

Question 39

What is the most common location of Ulnar Nerve Injury?

Answer 39

Posterior to Medial Epicondyle
(Funny Bone)

Question 40

A fracture of the medial epicondyle may cause compression also known as what?

Answer 40

Cubital Tunnel Syndrome

Question 41

Results from the DIP joint being forced into extreme flexion.

Answer 41

Mallet or Baseball Finger