Chapter 3B (The Forearm)

Question 1

Superficial layer of muscles of the forearm

Answer 1

• Pronator teres
• Flexor carpi radialis (FCR)
• Palmaris longus
• Flexor carpi ulnaris (FCU)

Question 2

Pronator teres

Answer 2

Flexes and pronates forearm

Question 3

Flexor carpi radialis (FCR)

Answer 3

Flexes and abducts the wrist

Question 4

Palmaris longus

Answer 4

Act as a guide to the median nerve, tenses the palmar aponeurosis

Question 5

Flexor carpi ulnaris (FCU)

Answer 5

Guide to the ulnar nerve and artery, flexes and adducts the wrist

Question 6

Intermediate layer of muscles of the forearm

Answer 6

Flexor digitorum superficialis (FDS)

Question 7

Flexor digitorum superficialis (FDS)

Answer 7

Flexes the PIP and MCP joints of digits 2-5, may flex each digit individually

Question 8

Deep layer of muscles in the forearm

Answer 8

• Flexor digitorum profundus (FDP)
• Flexor pollicis longus (FPL)
• Pronator quadratus

Question 9

Flexor digitorum profundus (FDP)

Answer 9

Flexes DIP joints after FDS flexes the PIP joints, its tendons pass posterior to the FDS tendons

Question 10

Flexor pollicis longus (FPL)

Answer 10

The only muscle that flexes the IP joint of the thumb

Question 11

Pronator quadratus

Answer 11

Prime mover and INITIATING muscle for pronation

Question 12

Muscles that extend and abduct/adduct the wrist joint

Answer 12

• Extensor carpi radialis longus
• Extensor carpi radialis brevis
• Extensor carpi ulnaris

Question 13

Extensor carpi radialis longus

Answer 13

Extends and abducts the wrist, active when fist is clenched

Question 14

Extensor carpi radialis brevis

Answer 14

Extends and abducts the wrist

Question 15

Extensor carpi ulnaris

Answer 15

Extends and adducts the wrist, active when fist is clenched

Question 16

Muscles that extend the 4 fingers

Answer 16

• Extensor digitorum
• Extensor indicis
• Extensor digiti minimi

Question 17

Extensor digitorum

Answer 17

Principal extensor of digits 2-5 at the proximal phalanges

Question 18

Extensor indicis

Answer 18

Extend the index finger at the PIP joint and help extend the hand

Question 19

Extensor digiti minimi

Answer 19

Runs through the extensor retinaculum, contributes to extension of the 5th digit at MCP and IP joint

Question 20

Muscles that extend or abduct the thumb

Answer 20

• Abductor pollicis longus
• Extensor pollicis brevis
• Extensor pollicis longus

Question 21

Abductor pollicis longus

Answer 21

Abducts and extends thumb

Question 22

Extensor pollicis brevis

Answer 22

Helps form the anatomical snuff box; extends the 1st MCP and extend and abduct the hand

Question 23

Extetnsor pollicis longus

Answer 23

Helps form the anatomical snuff box; adducts, extends and laterally rotates thumb

Question 24

The only muscles of the compartment that do not cross and are capable of acting on the wrist

Answer 24

Brachioradialis and supinator

Question 25

Brachioradialis

Answer 25

Flexes the forearm at the elbow, helps resist subluxation of the head of radius

Question 26

Supinator

Answer 26

Prime mover for slow, unopposed supination

Question 27

The main arteries of the forearm are the ____ and _____ arteries.

Answer 27

Ulnar and radial

Question 28

Ulnar artery and its branches supply the…

Answer 28

muscles of the medial and central forearm, common flexor sheath, and ulnar/median nerves

Question 29

Radial artery helps demarcate the boundaries of the flexor and extensor compartments of the forearm, helps supply…

Answer 29

the anterolateral aspects of both flexor and extensor compartments

Question 30

Deep veins begins as the …

Answer 30

Deep venous palmar arch

Question 31

The deep veins connect to the ____ ____ ____ ____, as well as the accompanying veins of the brachial artery.

Answer 31

Median cubital vein superficially

Question 32

Common place for measuring pulse rate is there the ____ artery lies on the _____ surface of the distal end of the radius, just lateral to the tendon of the FCR.

Answer 32

Radial; anterior

Question 33

If a pulse cannot be felt, it may be due to an ____ ____ ___ on one side, making it difficult to palpate

Answer 33

aberrant radial artery