Muscles of the Anterior Forearm

Question 1

What categories are the muscles of the anterior forearm split into?

Answer 1

Superficial, Intermediate, Deep

Question 2

What do the muscles in the anterior compartment of the forearm do?

Answer 2

In general, produce flexion at the wrist and fingers, and pronation

Question 3

What are the superficial muscles of the anterior forearm?

Answer 3

Flexor carpi ulnaris
Palmaris longus
Flexor carpi radialis
Pronator teres

Question 4

What do all the muscles of the superficial compartment of the anterior forearm originate from?

Answer 4

A common tendon, which arises from the medial epicondyle of the humerus

Question 5

What does the flexor carpi ulnaris have?

Answer 5

A humeral and ulnar head

Question 6

What is the innervation of the FCU?

Answer 6

Ulnar nerve (C7, C8)

Question 7

What % of the population is the palmaris longus absent in?

Answer 7

15%

Question 8

What is the innervation of the palmaris longus?

Answer 8

Median nerve (C7, C8)

Question 9

What is the arterial supply of the palmaris longus?

Answer 9

Ulnar artery

Question 10

What is the function of the palmaris longus?

Answer 10

Flexes hand at wrist

Tenses palmar aponeurosis

Question 11

What is the innervation of the FCR?

Answer 11

Median nerve (C6, C7)

Question 12

What is the arterial supply of the FCR?

Answer 12

Ulnar artery

Question 13

What is the action of the FCR?

Answer 13

Flexes and abducts hand (at wrist)

Question 14

What does the lateral border of the pronator teres form?

Answer 14

The medial border of the cubital fossa

Question 15

What does the pronator teres have?

Answer 15

An ulnar head and a humeral head

Question 16

What is the innervation of the pronator teres?

Answer 16

Median nerve (C6, C7)

Question 17

What is the arterial supply of the pronator teres?

Answer 17

Ulnar artery

Anterior ulnar recurrent artery

Question 18

What is the main action of the pronator teres?

Answer 18

Pronates and flexes the forearm at the elbow

Question 19

What muscle is in the intermediate compartment of the anterior forearm?

Answer 19

Flexor digitorum superficialis

Question 20

Why is the flexor digitorum superficialis a good anatomical landmark?

Answer 20

The median nerve and ulnar artery pass between its two heads, and then travel posteriorly

Question 21

What does the FDS have?

Answer 21

Humero-ulnar head

Radial head

Question 22

What happens to the FDS at the wrist?

Answer 22

It splits into four tendons, which travel to through the carpal tunnel

Question 23

What is the innervation of the FDS?

Answer 23

Median nerve (C7, C8, T1)

Question 24

What is the arterial supply of the FDS?

Answer 24

Ulnar artery

Question 25

What is the main action of the FDS?

Answer 25

Flexes middle phalanges at proximal interphalangeal joints of middle four digits  Acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints

Question 26

What are the muscles of the deep anterior forearm?

Answer 26

Flexor digitorum profundus  Flexor pollicis longus  Pronator quadratus

Question 27

What does the flexor digitorum profundus have?

Answer 27

Medial part and lateral part

Question 28

What happens to the FDP at the wrist?

Answer 28

It splits into four tendons which pass through the carpal tunnel

Question 29

What is the innervation of the medial part of the FDP?

Answer 29

Ulnar nerve (C8, T1)

Question 30

What is the innervation of the lateral part of the FDP?

Answer 30

Anterior interosseous nerve, from median nerve (C8, T1)

Question 31

What is the arterial supply for the FDP?

Answer 31

Ulnar artery  | Anterior interosseous artery

Question 32

What is the main action of the medial part of the FDP?

Answer 32

Flexes distal phalanges 4 and 5 at the distal interphalangeal joints

Question 33

What is the main action of the lateral part of the FDP?

Answer 33

Flexes distal phalanges 2 and 3 at the distal phalangeal joints

Question 34

Where does the flexor pollicis longus lie?

Answer 34

Laterally to the FDP

Question 35

What is the innervation of the FPL?

Answer 35

Anterior interosseous nerve, from median nerve (C8, T1)

Question 36

What is the arterial supply of the FPL?

Answer 36

Anterior interosseous artery

Question 37

What is the main action of the FPL?

Answer 37

Flexes phalanges of thumb

Question 38

What shape is the pronator quadratus?

Answer 38

Square

Question 39

Where is the pronator quadratus found?

Answer 39

Deep to the tendons of the FDP and FPL

Question 40

What is the innervation of the pronator quadratus?

Answer 40

Anterior interosseous nerve, from median nerve (C8, T1)

Question 41

What is the arterial supply of the pronator quadratus?

Answer 41

Anterior interosseous artery

Question 42

What is the main function of the pronator quadratus?

Answer 42

Pronate forearm  | Deep fibres bind radius and ulna together