Muscles of the Anterior Forearm Flashcards Preview

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Flashcards in Muscles of the Anterior Forearm Deck (62):
1

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

Superficial, Intermediate, Deep

2

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

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

3

What are the superficial muscles of the anterior forearm?

Flexor carpi ulnaris 
Palmaris longus 
Flexor carpi radialis 
Pronator teres

4

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

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

5

What does the flexor carpi ulnaris have?

A humeral and ulnar head

6

What is the proximal attachment of the humeral head of the FCU?

Medial epicondyle of the humerus (common flexor origin)

7

What is the proximal attachment of the ulnar head of the FCU?

Olecranon and posterior border of ulna (via aponeurosis)

8

What is the distal attachment of the FCU?

Pisiform
Hook of hamate 
5th metacarpal

9

What is the innervation of the FCU?

Ulnar nerve (C7, C8)

10

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

15%

11

What is the proximal attachment of the palmaris longus?

Medial epicondyle of the humerus (common flexor origin)

12

What is the distal attachment of the palmaris longus?

Distal half of the flexor retinaculum and apex of palmar aponeurosis

13

What is the innervation of the palmaris longus?

Median nerve (C7, C8)

14

What is the arterial supply of the palmaris longus?

Ulnar artery

15

What is the function of the palmaris longus?

Flexes hand at wrist 
Tenses palmar aponeurosis

16

What is the proximal attachment of the flexor carpi radialis?

Medial epicondyle of the humerus (common flexor origin)

17

What is the distal attachment of the FCR?

Base of 2nd metacarpal

18

What is the innervation of the FCR?

Median nerve (C6, C7)

19

What is the arterial supply of the FCR?

Ulnar artery

20

What is the action of the FCR?

Flexes and abducts hand (at wrist)

21

What does the lateral border of the pronator teres form?

The medial border of the cubital fossa

22

What does the pronator teres have?

An ulnar head and a humeral head

23

What is the proximal attachment of the ulnar head of the pronator teres?

Coronoid process

24

What is the proximal attachment of the humeral head of the pronator teres?

Medial epicondyle of the humerus (common flexor origin)

25

What is the distal attachment of the pronator teres?

Middle of convexity of the lateral surface of the radius

26

What is the innervation of the pronator teres?

Median nerve (C6, C7)

27

What is the arterial supply of the pronator teres?

Ulnar artery 
Anterior ulnar recurrent artery

28

What is the main action of the pronator teres?

Pronates and flexes the forearm at the elbow

29

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

Flexor digitorum superficialis

30

Why is the flexor digitorum superficialis a good anatomical landmark?

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

31

What does the FDS have?

Humero-ulnar head
Radial head

32

What is the proximal attachment of the humero-ulnar head of the FDS?

Medial epicondyle (common flexor origin) and coronoid process

33

What is the proximal attachment of the radial head of the FDS?

Superior half of anterior border of the radius

34

What happens to the FDS at the wrist?

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

35

Where is the distal attachment of the FDS?

Shafts of the middle phalanges of medial four digits

36

What is the innervation of the FDS?

Median nerve (C7, C8, T1)

37

What is the arterial supply of the FDS?

Ulnar artery

38

What is the main action of the FDS?

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

39

What are the muscles of the deep anterior forearm?

Flexor digitorum profundus 
Flexor pollicis longus 
Pronator quadratus

40

What does the flexor digitorum profundus have?

Medial part and lateral part

41

What is the proximal attachment of the FDP?

Proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane

42

What happens to the FDP at the wrist?

It splits into four tendons which pass through the carpal tunnel

43

What is the distal attachment of the medial part of the FDP?

Bases of distal phalanges of 4th and 5th digits

44

What is the distal attachment of the lateral part of the FDP?

Bases of the distal phalanges of the 2nd and 3rd digits

45

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

Ulnar nerve (C8, T1)

46

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

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

47

What is the arterial supply for the FDP?

Ulnar artery 
Anterior interosseous artery

48

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

Flexes distal phalanges 4 and 5 at the distal interphalangeal joints

49

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

Flexes distal phalanges 2 and 3 at the distal phalangeal joints

50

Where does the flexor pollicis longus lie?

Laterally to the FDP

51

What is the proximal attachment of the FPL?

Anterior surface of the radius and adjacent interosseous membrane

52

What is the distal attachment of the FPL?

Base of distal phalanx of the thumb

53

What is the innervation of the FPL?

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

54

What is the arterial supply of the FPL?

Anterior interosseous artery

55

What is the main action of the FPL?

Flexes phalanges of thumb

56

What shape is the pronator quadratus?

Square

57

Where is the pronator quadratus found?

Deep to the tendons of the FDP and FPL

58

What is the proximal attachment of the pronator quadratus?

Distal quarter of anterior surface of ulna

59

What is the distal attachment of the pronator quadratus?

Distal quarter of anterior surface of radius

60

What is the innervation of the pronator quadratus?

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

61

What is the arterial supply of the pronator quadratus?

Anterior interosseous artery

62

What is the main function of the pronator quadratus?

Pronate forearm 
Deep fibres bind radius and ulna together